From 77c93e2d169c9ac4f720f1e1c130c920b015a357 Mon Sep 17 00:00:00 2001
From: "Paul A. Jungwirth" <pj@illuminatedcomputing.com>
Date: Fri, 31 Oct 2025 19:59:52 -0700
Subject: [PATCH v59 06/11] Add isolation tests for UPDATE/DELETE FOR PORTION
 OF

Concurrent updates/deletes in READ COMMITTED mode don't give you what you want:
the second update/delete fails to leftovers from the first, so you essentially
have lost updates/deletes. But we are following the rules, and other RDBMSes
give you screwy results in READ COMMITTED too (albeit different).

One approach is to lock the history you want with SELECT FOR UPDATE before
issuing the actual UPDATE/DELETE. That way you see the leftovers of anyone else
who also touched that history. The isolation tests here use that approach and
show that it's viable.
---
 doc/src/sgml/dml.sgml                         |   16 +
 src/backend/executor/nodeModifyTable.c        |    4 +
 .../isolation/expected/for-portion-of.out     | 5803 +++++++++++++++++
 src/test/isolation/isolation_schedule         |    1 +
 src/test/isolation/specs/for-portion-of.spec  |  751 +++
 5 files changed, 6575 insertions(+)
 create mode 100644 src/test/isolation/expected/for-portion-of.out
 create mode 100644 src/test/isolation/specs/for-portion-of.spec

diff --git a/doc/src/sgml/dml.sgml b/doc/src/sgml/dml.sgml
index a899c9ab447..e4afedf4d7a 100644
--- a/doc/src/sgml/dml.sgml
+++ b/doc/src/sgml/dml.sgml
@@ -394,6 +394,22 @@ WHERE id = 5;
    column references are not.
   </para>
 
+  <para>
+   In <literal>READ COMMITTED</literal> mode, temporal updates and deletes can
+   cause unexpected results when they concurrently touch the same row. It is
+   possible to lose all or part of the second update or delete. That's because
+   after the first update changes the start/end times of the original
+   record, it may no longer fit within the second query's <literal>FOR PORTION
+   OF</literal> bounds, so it becomes disqualified from the query. On the other
+   hand the just-inserted temporal leftovers may be overlooked by the second query,
+   which has already scanned the table to find rows to modify. To solve these
+   problems, precede every temporal update/delete with a <literal>SELECT FOR
+   UPDATE</literal> matching the same criteria (including the targeted portion of
+   application time). That way the actual update/delete doesn't begin until the
+   lock is held, and all concurrent leftovers will be visible. In other
+   transaction isolation levels, this lock is not required.
+  </para>
+
   <para>
    When temporal leftovers are inserted, all <literal>INSERT</literal>
    triggers are fired, but permission checks for inserting rows are
diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
index 665dbc18239..857139ec58b 100644
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -1403,6 +1403,10 @@ ExecForPortionOfLeftovers(ModifyTableContext *context,
 	 * We have already locked the tuple in ExecUpdate/ExecDelete, and it has
 	 * passed EvalPlanQual. This ensures that concurrent updates in READ
 	 * COMMITTED can't insert conflicting temporal leftovers.
+	 *
+	 * It does *not* protect against concurrent update/deletes overlooking each
+	 * others' leftovers though. See our isolation tests for details about that
+	 * and a viable workaround.
 	 */
 	if (!table_tuple_fetch_row_version(resultRelInfo->ri_RelationDesc, tupleid, SnapshotAny, oldtupleSlot))
 		elog(ERROR, "failed to fetch tuple for FOR PORTION OF");
diff --git a/src/test/isolation/expected/for-portion-of.out b/src/test/isolation/expected/for-portion-of.out
new file mode 100644
index 00000000000..89f646dd899
--- /dev/null
+++ b/src/test/isolation/expected/for-portion-of.out
@@ -0,0 +1,5803 @@
+Parsed test spec with 2 sessions
+
+starting permutation: s1rc s2rc s2lock2027 s2upd2027 s2c s1lock2025 s1upd2025 s1c s1q
+step s1rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2lock2027: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2027-01-01,2028-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2upd2027: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1lock2025: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-01-01,2026-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2027-01-01)| 5.00
+(1 row)
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2027-01-01)| 5.00
+[1,2)|[2027-01-01,2028-01-01)|10.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(5 rows)
+
+
+starting permutation: s1rc s2rc s2lock202503 s2upd202503 s2c s1lock2025 s1upd2025 s1c s1q
+step s1rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2lock202503: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-03-01,2025-04-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2upd202503: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1lock2025: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-01-01,2026-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-03-01)| 5.00
+[1,2)|[2025-03-01,2025-04-01)|10.00
+[1,2)|[2025-04-01,2030-01-01)| 5.00
+(3 rows)
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2025-03-01)| 8.00
+[1,2)|[2025-03-01,2025-04-01)| 8.00
+[1,2)|[2025-04-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(5 rows)
+
+
+starting permutation: s1rc s2rc s2lock20252026 s2upd20252026 s2c s1lock2025 s1upd2025 s1c s1q
+step s1rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2lock20252026: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-06-01,2026-06-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2upd20252026: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1lock2025: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-01-01,2026-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-06-01)| 5.00
+[1,2)|[2025-06-01,2026-06-01)|10.00
+(2 rows)
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2025-06-01)| 8.00
+[1,2)|[2025-06-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2026-06-01)|10.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(5 rows)
+
+
+starting permutation: s1rc s2rc s1lock2025 s1upd2025 s1c s2lock2027 s2upd2027 s2c s1q
+step s1rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s1lock2025: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-01-01,2026-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2lock2027: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2027-01-01,2028-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2upd2027: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2027-01-01)| 5.00
+[1,2)|[2027-01-01,2028-01-01)|10.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(5 rows)
+
+
+starting permutation: s1rc s2rc s1lock2025 s1upd2025 s1c s2lock202503 s2upd202503 s2c s1q
+step s1rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s1lock2025: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-01-01,2026-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2lock202503: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-03-01,2025-04-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2025-01-01,2026-01-01)| 8.00
+(1 row)
+
+step s2upd202503: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2025-03-01)| 8.00
+[1,2)|[2025-03-01,2025-04-01)|10.00
+[1,2)|[2025-04-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(5 rows)
+
+
+starting permutation: s1rc s2rc s1lock2025 s1upd2025 s1c s2lock20252026 s2upd20252026 s2c s1q
+step s1rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s1lock2025: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-01-01,2026-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2lock20252026: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-06-01,2026-06-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2025-01-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(2 rows)
+
+step s2upd20252026: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2025-06-01)| 8.00
+[1,2)|[2025-06-01,2026-01-01)|10.00
+[1,2)|[2026-01-01,2026-06-01)|10.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(5 rows)
+
+
+starting permutation: s1rc s2rc s2lock2027 s2upd2027 s1lock2025 s2c s1upd2025 s1c s1q
+step s1rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2lock2027: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2027-01-01,2028-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2upd2027: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s1lock2025: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-01-01,2026-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+ <waiting ...>
+step s2c: COMMIT;
+step s1lock2025: <... completed>
+id|valid_at|price
+--+--------+-----
+(0 rows)
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2027-01-01)| 5.00
+[1,2)|[2027-01-01,2028-01-01)|10.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(5 rows)
+
+
+starting permutation: s1rc s2rc s2lock202503 s2upd202503 s1lock2025 s2c s1upd2025 s1c s1q
+step s1rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2lock202503: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-03-01,2025-04-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2upd202503: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s1lock2025: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-01-01,2026-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+ <waiting ...>
+step s2c: COMMIT;
+step s1lock2025: <... completed>
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2025-03-01,2025-04-01)|10.00
+(1 row)
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2025-03-01)| 8.00
+[1,2)|[2025-03-01,2025-04-01)| 8.00
+[1,2)|[2025-04-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(5 rows)
+
+
+starting permutation: s1rc s2rc s2lock20252026 s2upd20252026 s1lock2025 s2c s1upd2025 s1c s1q
+step s1rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2lock20252026: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-06-01,2026-06-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2upd20252026: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s1lock2025: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-01-01,2026-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+ <waiting ...>
+step s2c: COMMIT;
+step s1lock2025: <... completed>
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2025-06-01,2026-06-01)|10.00
+(1 row)
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2025-06-01)| 8.00
+[1,2)|[2025-06-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2026-06-01)|10.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(5 rows)
+
+
+starting permutation: s1rc s2rc s2lock2027 s2del2027 s2c s1lock2025 s1upd2025 s1c s1q
+step s1rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2lock2027: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2027-01-01,2028-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2del2027: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1lock2025: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-01-01,2026-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2027-01-01)| 5.00
+(1 row)
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2027-01-01)| 5.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(4 rows)
+
+
+starting permutation: s1rc s2rc s2lock202503 s2del202503 s2c s1lock2025 s1upd2025 s1c s1q
+step s1rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2lock202503: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-03-01,2025-04-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2del202503: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1lock2025: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-01-01,2026-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-03-01)| 5.00
+[1,2)|[2025-04-01,2030-01-01)| 5.00
+(2 rows)
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2025-03-01)| 8.00
+[1,2)|[2025-04-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(4 rows)
+
+
+starting permutation: s1rc s2rc s2lock20252026 s2del20252026 s2c s1lock2025 s1upd2025 s1c s1q
+step s1rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2lock20252026: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-06-01,2026-06-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2del20252026: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1lock2025: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-01-01,2026-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-06-01)| 5.00
+(1 row)
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2025-06-01)| 8.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1rc s2rc s1lock2025 s1upd2025 s1c s2lock2027 s2del2027 s2c s1q
+step s1rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s1lock2025: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-01-01,2026-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2lock2027: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2027-01-01,2028-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2del2027: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2027-01-01)| 5.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(4 rows)
+
+
+starting permutation: s1rc s2rc s1lock2025 s1upd2025 s1c s2lock202503 s2del202503 s2c s1q
+step s1rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s1lock2025: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-01-01,2026-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2lock202503: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-03-01,2025-04-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2025-01-01,2026-01-01)| 8.00
+(1 row)
+
+step s2del202503: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2025-03-01)| 8.00
+[1,2)|[2025-04-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(4 rows)
+
+
+starting permutation: s1rc s2rc s1lock2025 s1upd2025 s1c s2lock20252026 s2del20252026 s2c s1q
+step s1rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s1lock2025: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-01-01,2026-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2lock20252026: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-06-01,2026-06-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2025-01-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(2 rows)
+
+step s2del20252026: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2025-06-01)| 8.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1rc s2rc s2lock2027 s2del2027 s1lock2025 s2c s1upd2025 s1c s1q
+step s1rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2lock2027: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2027-01-01,2028-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2del2027: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  WHERE id = '[1,2)';
+
+step s1lock2025: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-01-01,2026-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+ <waiting ...>
+step s2c: COMMIT;
+step s1lock2025: <... completed>
+id|valid_at|price
+--+--------+-----
+(0 rows)
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2027-01-01)| 5.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(4 rows)
+
+
+starting permutation: s1rc s2rc s2lock202503 s2del202503 s1lock2025 s2c s1upd2025 s1c s1q
+step s1rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2lock202503: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-03-01,2025-04-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2del202503: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  WHERE id = '[1,2)';
+
+step s1lock2025: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-01-01,2026-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+ <waiting ...>
+step s2c: COMMIT;
+step s1lock2025: <... completed>
+id|valid_at|price
+--+--------+-----
+(0 rows)
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2025-03-01)| 8.00
+[1,2)|[2025-04-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(4 rows)
+
+
+starting permutation: s1rc s2rc s2lock20252026 s2del20252026 s1lock2025 s2c s1upd2025 s1c s1q
+step s1rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2lock20252026: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-06-01,2026-06-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2del20252026: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  WHERE id = '[1,2)';
+
+step s1lock2025: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-01-01,2026-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+ <waiting ...>
+step s2c: COMMIT;
+step s1lock2025: <... completed>
+id|valid_at|price
+--+--------+-----
+(0 rows)
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2025-06-01)| 8.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1rc s2rc s2lock2027 s2upd2027 s2c s1lock2025 s1del2025 s1c s1q
+step s1rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2lock2027: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2027-01-01,2028-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2upd2027: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1lock2025: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-01-01,2026-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2027-01-01)| 5.00
+(1 row)
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2027-01-01)| 5.00
+[1,2)|[2027-01-01,2028-01-01)|10.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(4 rows)
+
+
+starting permutation: s1rc s2rc s2lock202503 s2upd202503 s2c s1lock2025 s1del2025 s1c s1q
+step s1rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2lock202503: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-03-01,2025-04-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2upd202503: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1lock2025: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-01-01,2026-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-03-01)| 5.00
+[1,2)|[2025-03-01,2025-04-01)|10.00
+[1,2)|[2025-04-01,2030-01-01)| 5.00
+(3 rows)
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1rc s2rc s2lock20252026 s2upd20252026 s2c s1lock2025 s1del2025 s1c s1q
+step s1rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2lock20252026: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-06-01,2026-06-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2upd20252026: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1lock2025: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-01-01,2026-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-06-01)| 5.00
+[1,2)|[2025-06-01,2026-06-01)|10.00
+(2 rows)
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2026-06-01)|10.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1rc s2rc s1lock2025 s1del2025 s1c s2lock2027 s2upd2027 s2c s1q
+step s1rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s1lock2025: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-01-01,2026-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2lock2027: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2027-01-01,2028-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2upd2027: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2027-01-01)| 5.00
+[1,2)|[2027-01-01,2028-01-01)|10.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(4 rows)
+
+
+starting permutation: s1rc s2rc s1lock2025 s1del2025 s1c s2lock202503 s2upd202503 s2c s1q
+step s1rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s1lock2025: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-01-01,2026-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2lock202503: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-03-01,2025-04-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id|valid_at|price
+--+--------+-----
+(0 rows)
+
+step s2upd202503: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1rc s2rc s1lock2025 s1del2025 s1c s2lock20252026 s2upd20252026 s2c s1q
+step s1rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s1lock2025: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-01-01,2026-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2lock20252026: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-06-01,2026-06-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2upd20252026: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2026-06-01)|10.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1rc s2rc s2lock2027 s2upd2027 s1lock2025 s2c s1del2025 s1c s1q
+step s1rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2lock2027: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2027-01-01,2028-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2upd2027: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s1lock2025: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-01-01,2026-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+ <waiting ...>
+step s2c: COMMIT;
+step s1lock2025: <... completed>
+id|valid_at|price
+--+--------+-----
+(0 rows)
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2027-01-01)| 5.00
+[1,2)|[2027-01-01,2028-01-01)|10.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(4 rows)
+
+
+starting permutation: s1rc s2rc s2lock202503 s2upd202503 s1lock2025 s2c s1del2025 s1c s1q
+step s1rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2lock202503: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-03-01,2025-04-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2upd202503: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s1lock2025: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-01-01,2026-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+ <waiting ...>
+step s2c: COMMIT;
+step s1lock2025: <... completed>
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2025-03-01,2025-04-01)|10.00
+(1 row)
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1rc s2rc s2lock20252026 s2upd20252026 s1lock2025 s2c s1del2025 s1c s1q
+step s1rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2lock20252026: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-06-01,2026-06-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2upd20252026: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s1lock2025: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-01-01,2026-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+ <waiting ...>
+step s2c: COMMIT;
+step s1lock2025: <... completed>
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2025-06-01,2026-06-01)|10.00
+(1 row)
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2026-06-01)|10.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1rc s2rc s2lock2027 s2del2027 s2c s1lock2025 s1del2025 s1c s1q
+step s1rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2lock2027: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2027-01-01,2028-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2del2027: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1lock2025: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-01-01,2026-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2027-01-01)| 5.00
+(1 row)
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2027-01-01)| 5.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1rc s2rc s2lock202503 s2del202503 s2c s1lock2025 s1del2025 s1c s1q
+step s1rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2lock202503: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-03-01,2025-04-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2del202503: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1lock2025: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-01-01,2026-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-03-01)| 5.00
+[1,2)|[2025-04-01,2030-01-01)| 5.00
+(2 rows)
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1rc s2rc s2lock20252026 s2del20252026 s2c s1lock2025 s1del2025 s1c s1q
+step s1rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2lock20252026: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-06-01,2026-06-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2del20252026: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1lock2025: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-01-01,2026-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-06-01)| 5.00
+(1 row)
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1rc s2rc s1lock2025 s1del2025 s1c s2lock2027 s2del2027 s2c s1q
+step s1rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s1lock2025: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-01-01,2026-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2lock2027: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2027-01-01,2028-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2del2027: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2027-01-01)| 5.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1rc s2rc s1lock2025 s1del2025 s1c s2lock202503 s2del202503 s2c s1q
+step s1rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s1lock2025: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-01-01,2026-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2lock202503: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-03-01,2025-04-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id|valid_at|price
+--+--------+-----
+(0 rows)
+
+step s2del202503: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1rc s2rc s1lock2025 s1del2025 s1c s2lock20252026 s2del20252026 s2c s1q
+step s1rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s1lock2025: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-01-01,2026-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2lock20252026: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-06-01,2026-06-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2del20252026: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1rc s2rc s2lock2027 s2del2027 s1lock2025 s2c s1del2025 s1c s1q
+step s1rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2lock2027: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2027-01-01,2028-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2del2027: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  WHERE id = '[1,2)';
+
+step s1lock2025: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-01-01,2026-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+ <waiting ...>
+step s2c: COMMIT;
+step s1lock2025: <... completed>
+id|valid_at|price
+--+--------+-----
+(0 rows)
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2027-01-01)| 5.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1rc s2rc s2lock202503 s2del202503 s1lock2025 s2c s1del2025 s1c s1q
+step s1rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2lock202503: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-03-01,2025-04-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2del202503: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  WHERE id = '[1,2)';
+
+step s1lock2025: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-01-01,2026-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+ <waiting ...>
+step s2c: COMMIT;
+step s1lock2025: <... completed>
+id|valid_at|price
+--+--------+-----
+(0 rows)
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1rc s2rc s2lock20252026 s2del20252026 s1lock2025 s2c s1del2025 s1c s1q
+step s1rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2rc: BEGIN ISOLATION LEVEL READ COMMITTED;
+step s2lock20252026: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-06-01,2026-06-01)'
+  ORDER BY valid_at FOR UPDATE;
+
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2del20252026: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  WHERE id = '[1,2)';
+
+step s1lock2025: 
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-01-01,2026-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+ <waiting ...>
+step s2c: COMMIT;
+step s1lock2025: <... completed>
+id|valid_at|price
+--+--------+-----
+(0 rows)
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1rr s2rr s2upd2027 s2c s1upd2025 s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2upd2027: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2027-01-01)| 5.00
+[1,2)|[2027-01-01,2028-01-01)|10.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(5 rows)
+
+
+starting permutation: s1rr s2rr s2upd202503 s2c s1upd2025 s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2upd202503: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2025-03-01)| 8.00
+[1,2)|[2025-03-01,2025-04-01)| 8.00
+[1,2)|[2025-04-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(5 rows)
+
+
+starting permutation: s1rr s2rr s2upd20252026 s2c s1upd2025 s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2upd20252026: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2025-06-01)| 8.00
+[1,2)|[2025-06-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2026-06-01)|10.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(5 rows)
+
+
+starting permutation: s1rr s2rr s1upd2025 s1c s2upd2027 s2c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2upd2027: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2027-01-01)| 5.00
+[1,2)|[2027-01-01,2028-01-01)|10.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(5 rows)
+
+
+starting permutation: s1rr s2rr s1upd2025 s1c s2upd202503 s2c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2upd202503: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2025-03-01)| 8.00
+[1,2)|[2025-03-01,2025-04-01)|10.00
+[1,2)|[2025-04-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(5 rows)
+
+
+starting permutation: s1rr s2rr s1upd2025 s1c s2upd20252026 s2c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2upd20252026: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2025-06-01)| 8.00
+[1,2)|[2025-06-01,2026-01-01)|10.00
+[1,2)|[2026-01-01,2026-06-01)|10.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(5 rows)
+
+
+starting permutation: s1rr s2rr s2upd2027 s1upd2025 s2c s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2upd2027: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1upd2025: <... completed>
+ERROR:  could not serialize access due to concurrent update
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2027-01-01)| 5.00
+[1,2)|[2027-01-01,2028-01-01)|10.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1rr s2rr s2upd202503 s1upd2025 s2c s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2upd202503: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1upd2025: <... completed>
+ERROR:  could not serialize access due to concurrent update
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-03-01)| 5.00
+[1,2)|[2025-03-01,2025-04-01)|10.00
+[1,2)|[2025-04-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1rr s2rr s2upd20252026 s1upd2025 s2c s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2upd20252026: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1upd2025: <... completed>
+ERROR:  could not serialize access due to concurrent update
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-06-01)| 5.00
+[1,2)|[2025-06-01,2026-06-01)|10.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1rr s2rr s1q s2upd2027 s2c s1upd2025 s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2upd2027: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+ERROR:  could not serialize access due to concurrent update
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2027-01-01)| 5.00
+[1,2)|[2027-01-01,2028-01-01)|10.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1rr s2rr s1q s2upd202503 s2c s1upd2025 s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2upd202503: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+ERROR:  could not serialize access due to concurrent update
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-03-01)| 5.00
+[1,2)|[2025-03-01,2025-04-01)|10.00
+[1,2)|[2025-04-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1rr s2rr s1q s2upd20252026 s2c s1upd2025 s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2upd20252026: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+ERROR:  could not serialize access due to concurrent update
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-06-01)| 5.00
+[1,2)|[2025-06-01,2026-06-01)|10.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1rr s2rr s1q s1upd2025 s1c s2upd2027 s2c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2upd2027: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2027-01-01)| 5.00
+[1,2)|[2027-01-01,2028-01-01)|10.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(5 rows)
+
+
+starting permutation: s1rr s2rr s1q s1upd2025 s1c s2upd202503 s2c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2upd202503: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2025-03-01)| 8.00
+[1,2)|[2025-03-01,2025-04-01)|10.00
+[1,2)|[2025-04-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(5 rows)
+
+
+starting permutation: s1rr s2rr s1q s1upd2025 s1c s2upd20252026 s2c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2upd20252026: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2025-06-01)| 8.00
+[1,2)|[2025-06-01,2026-01-01)|10.00
+[1,2)|[2026-01-01,2026-06-01)|10.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(5 rows)
+
+
+starting permutation: s1rr s2rr s1q s2upd2027 s1upd2025 s2c s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2upd2027: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1upd2025: <... completed>
+ERROR:  could not serialize access due to concurrent update
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2027-01-01)| 5.00
+[1,2)|[2027-01-01,2028-01-01)|10.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1rr s2rr s1q s2upd202503 s1upd2025 s2c s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2upd202503: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1upd2025: <... completed>
+ERROR:  could not serialize access due to concurrent update
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-03-01)| 5.00
+[1,2)|[2025-03-01,2025-04-01)|10.00
+[1,2)|[2025-04-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1rr s2rr s1q s2upd20252026 s1upd2025 s2c s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2upd20252026: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1upd2025: <... completed>
+ERROR:  could not serialize access due to concurrent update
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-06-01)| 5.00
+[1,2)|[2025-06-01,2026-06-01)|10.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1rr s2rr s2del2027 s2c s1upd2025 s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2del2027: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2027-01-01)| 5.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(4 rows)
+
+
+starting permutation: s1rr s2rr s2del202503 s2c s1upd2025 s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2del202503: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2025-03-01)| 8.00
+[1,2)|[2025-04-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(4 rows)
+
+
+starting permutation: s1rr s2rr s2del20252026 s2c s1upd2025 s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2del20252026: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2025-06-01)| 8.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1rr s2rr s1upd2025 s1c s2del2027 s2c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2del2027: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2027-01-01)| 5.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(4 rows)
+
+
+starting permutation: s1rr s2rr s1upd2025 s1c s2del202503 s2c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2del202503: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2025-03-01)| 8.00
+[1,2)|[2025-04-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(4 rows)
+
+
+starting permutation: s1rr s2rr s1upd2025 s1c s2del20252026 s2c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2del20252026: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2025-06-01)| 8.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1rr s2rr s2del2027 s1upd2025 s2c s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2del2027: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  WHERE id = '[1,2)';
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1upd2025: <... completed>
+ERROR:  could not serialize access due to concurrent delete
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2027-01-01)| 5.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1rr s2rr s2del202503 s1upd2025 s2c s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2del202503: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  WHERE id = '[1,2)';
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1upd2025: <... completed>
+ERROR:  could not serialize access due to concurrent delete
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-03-01)| 5.00
+[1,2)|[2025-04-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1rr s2rr s2del20252026 s1upd2025 s2c s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2del20252026: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  WHERE id = '[1,2)';
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1upd2025: <... completed>
+ERROR:  could not serialize access due to concurrent delete
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-06-01)| 5.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1rr s2rr s1q s2del2027 s2c s1upd2025 s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2del2027: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+ERROR:  could not serialize access due to concurrent delete
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2027-01-01)| 5.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1rr s2rr s1q s2del202503 s2c s1upd2025 s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2del202503: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+ERROR:  could not serialize access due to concurrent delete
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-03-01)| 5.00
+[1,2)|[2025-04-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1rr s2rr s1q s2del20252026 s2c s1upd2025 s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2del20252026: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+ERROR:  could not serialize access due to concurrent delete
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-06-01)| 5.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1rr s2rr s1q s1upd2025 s1c s2del2027 s2c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2del2027: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2027-01-01)| 5.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(4 rows)
+
+
+starting permutation: s1rr s2rr s1q s1upd2025 s1c s2del202503 s2c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2del202503: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2025-03-01)| 8.00
+[1,2)|[2025-04-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(4 rows)
+
+
+starting permutation: s1rr s2rr s1q s1upd2025 s1c s2del20252026 s2c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2del20252026: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2025-06-01)| 8.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1rr s2rr s1q s2del2027 s1upd2025 s2c s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2del2027: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  WHERE id = '[1,2)';
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1upd2025: <... completed>
+ERROR:  could not serialize access due to concurrent delete
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2027-01-01)| 5.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1rr s2rr s1q s2del202503 s1upd2025 s2c s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2del202503: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  WHERE id = '[1,2)';
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1upd2025: <... completed>
+ERROR:  could not serialize access due to concurrent delete
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-03-01)| 5.00
+[1,2)|[2025-04-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1rr s2rr s1q s2del20252026 s1upd2025 s2c s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2del20252026: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  WHERE id = '[1,2)';
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1upd2025: <... completed>
+ERROR:  could not serialize access due to concurrent delete
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-06-01)| 5.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1rr s2rr s2upd2027 s2c s1del2025 s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2upd2027: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2027-01-01)| 5.00
+[1,2)|[2027-01-01,2028-01-01)|10.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(4 rows)
+
+
+starting permutation: s1rr s2rr s2upd202503 s2c s1del2025 s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2upd202503: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1rr s2rr s2upd20252026 s2c s1del2025 s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2upd20252026: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2026-06-01)|10.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1rr s2rr s1del2025 s1c s2upd2027 s2c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2upd2027: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2027-01-01)| 5.00
+[1,2)|[2027-01-01,2028-01-01)|10.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(4 rows)
+
+
+starting permutation: s1rr s2rr s1del2025 s1c s2upd202503 s2c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2upd202503: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1rr s2rr s1del2025 s1c s2upd20252026 s2c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2upd20252026: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2026-06-01)|10.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1rr s2rr s2upd2027 s1del2025 s2c s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2upd2027: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1del2025: <... completed>
+ERROR:  could not serialize access due to concurrent update
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2027-01-01)| 5.00
+[1,2)|[2027-01-01,2028-01-01)|10.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1rr s2rr s2upd202503 s1del2025 s2c s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2upd202503: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1del2025: <... completed>
+ERROR:  could not serialize access due to concurrent update
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-03-01)| 5.00
+[1,2)|[2025-03-01,2025-04-01)|10.00
+[1,2)|[2025-04-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1rr s2rr s2upd20252026 s1del2025 s2c s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2upd20252026: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1del2025: <... completed>
+ERROR:  could not serialize access due to concurrent update
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-06-01)| 5.00
+[1,2)|[2025-06-01,2026-06-01)|10.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1rr s2rr s1q s2upd2027 s2c s1del2025 s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2upd2027: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+ERROR:  could not serialize access due to concurrent update
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2027-01-01)| 5.00
+[1,2)|[2027-01-01,2028-01-01)|10.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1rr s2rr s1q s2upd202503 s2c s1del2025 s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2upd202503: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+ERROR:  could not serialize access due to concurrent update
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-03-01)| 5.00
+[1,2)|[2025-03-01,2025-04-01)|10.00
+[1,2)|[2025-04-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1rr s2rr s1q s2upd20252026 s2c s1del2025 s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2upd20252026: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+ERROR:  could not serialize access due to concurrent update
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-06-01)| 5.00
+[1,2)|[2025-06-01,2026-06-01)|10.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1rr s2rr s1q s1del2025 s1c s2upd2027 s2c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2upd2027: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2027-01-01)| 5.00
+[1,2)|[2027-01-01,2028-01-01)|10.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(4 rows)
+
+
+starting permutation: s1rr s2rr s1q s1del2025 s1c s2upd202503 s2c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2upd202503: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1rr s2rr s1q s1del2025 s1c s2upd20252026 s2c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2upd20252026: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2026-06-01)|10.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1rr s2rr s1q s2upd2027 s1del2025 s2c s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2upd2027: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1del2025: <... completed>
+ERROR:  could not serialize access due to concurrent update
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2027-01-01)| 5.00
+[1,2)|[2027-01-01,2028-01-01)|10.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1rr s2rr s1q s2upd202503 s1del2025 s2c s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2upd202503: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1del2025: <... completed>
+ERROR:  could not serialize access due to concurrent update
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-03-01)| 5.00
+[1,2)|[2025-03-01,2025-04-01)|10.00
+[1,2)|[2025-04-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1rr s2rr s1q s2upd20252026 s1del2025 s2c s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2upd20252026: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1del2025: <... completed>
+ERROR:  could not serialize access due to concurrent update
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-06-01)| 5.00
+[1,2)|[2025-06-01,2026-06-01)|10.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1rr s2rr s2del2027 s2c s1del2025 s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2del2027: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2027-01-01)| 5.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1rr s2rr s2del202503 s2c s1del2025 s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2del202503: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1rr s2rr s2del20252026 s2c s1del2025 s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2del20252026: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1rr s2rr s1del2025 s1c s2del2027 s2c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2del2027: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2027-01-01)| 5.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1rr s2rr s1del2025 s1c s2del202503 s2c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2del202503: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1rr s2rr s1del2025 s1c s2del20252026 s2c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2del20252026: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1rr s2rr s2del2027 s1del2025 s2c s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2del2027: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  WHERE id = '[1,2)';
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1del2025: <... completed>
+ERROR:  could not serialize access due to concurrent delete
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2027-01-01)| 5.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1rr s2rr s2del202503 s1del2025 s2c s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2del202503: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  WHERE id = '[1,2)';
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1del2025: <... completed>
+ERROR:  could not serialize access due to concurrent delete
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-03-01)| 5.00
+[1,2)|[2025-04-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1rr s2rr s2del20252026 s1del2025 s2c s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2del20252026: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  WHERE id = '[1,2)';
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1del2025: <... completed>
+ERROR:  could not serialize access due to concurrent delete
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-06-01)| 5.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1rr s2rr s1q s2del2027 s2c s1del2025 s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2del2027: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+ERROR:  could not serialize access due to concurrent delete
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2027-01-01)| 5.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1rr s2rr s1q s2del202503 s2c s1del2025 s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2del202503: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+ERROR:  could not serialize access due to concurrent delete
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-03-01)| 5.00
+[1,2)|[2025-04-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1rr s2rr s1q s2del20252026 s2c s1del2025 s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2del20252026: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+ERROR:  could not serialize access due to concurrent delete
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-06-01)| 5.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1rr s2rr s1q s1del2025 s1c s2del2027 s2c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2del2027: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2027-01-01)| 5.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1rr s2rr s1q s1del2025 s1c s2del202503 s2c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2del202503: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1rr s2rr s1q s1del2025 s1c s2del20252026 s2c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2del20252026: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1rr s2rr s1q s2del2027 s1del2025 s2c s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2del2027: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  WHERE id = '[1,2)';
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1del2025: <... completed>
+ERROR:  could not serialize access due to concurrent delete
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2027-01-01)| 5.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1rr s2rr s1q s2del202503 s1del2025 s2c s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2del202503: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  WHERE id = '[1,2)';
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1del2025: <... completed>
+ERROR:  could not serialize access due to concurrent delete
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-03-01)| 5.00
+[1,2)|[2025-04-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1rr s2rr s1q s2del20252026 s1del2025 s2c s1c s1q
+step s1rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s2rr: BEGIN ISOLATION LEVEL REPEATABLE READ;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2del20252026: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  WHERE id = '[1,2)';
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1del2025: <... completed>
+ERROR:  could not serialize access due to concurrent delete
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-06-01)| 5.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1ser s2ser s2upd2027 s2c s1upd2025 s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2upd2027: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2027-01-01)| 5.00
+[1,2)|[2027-01-01,2028-01-01)|10.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(5 rows)
+
+
+starting permutation: s1ser s2ser s2upd202503 s2c s1upd2025 s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2upd202503: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2025-03-01)| 8.00
+[1,2)|[2025-03-01,2025-04-01)| 8.00
+[1,2)|[2025-04-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(5 rows)
+
+
+starting permutation: s1ser s2ser s2upd20252026 s2c s1upd2025 s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2upd20252026: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2025-06-01)| 8.00
+[1,2)|[2025-06-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2026-06-01)|10.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(5 rows)
+
+
+starting permutation: s1ser s2ser s1upd2025 s1c s2upd2027 s2c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2upd2027: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2027-01-01)| 5.00
+[1,2)|[2027-01-01,2028-01-01)|10.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(5 rows)
+
+
+starting permutation: s1ser s2ser s1upd2025 s1c s2upd202503 s2c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2upd202503: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2025-03-01)| 8.00
+[1,2)|[2025-03-01,2025-04-01)|10.00
+[1,2)|[2025-04-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(5 rows)
+
+
+starting permutation: s1ser s2ser s1upd2025 s1c s2upd20252026 s2c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2upd20252026: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2025-06-01)| 8.00
+[1,2)|[2025-06-01,2026-01-01)|10.00
+[1,2)|[2026-01-01,2026-06-01)|10.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(5 rows)
+
+
+starting permutation: s1ser s2ser s2upd2027 s1upd2025 s2c s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2upd2027: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1upd2025: <... completed>
+ERROR:  could not serialize access due to concurrent update
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2027-01-01)| 5.00
+[1,2)|[2027-01-01,2028-01-01)|10.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1ser s2ser s2upd202503 s1upd2025 s2c s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2upd202503: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1upd2025: <... completed>
+ERROR:  could not serialize access due to concurrent update
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-03-01)| 5.00
+[1,2)|[2025-03-01,2025-04-01)|10.00
+[1,2)|[2025-04-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1ser s2ser s2upd20252026 s1upd2025 s2c s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2upd20252026: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1upd2025: <... completed>
+ERROR:  could not serialize access due to concurrent update
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-06-01)| 5.00
+[1,2)|[2025-06-01,2026-06-01)|10.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1ser s2ser s1q s2upd2027 s2c s1upd2025 s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2upd2027: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+ERROR:  could not serialize access due to concurrent update
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2027-01-01)| 5.00
+[1,2)|[2027-01-01,2028-01-01)|10.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1ser s2ser s1q s2upd202503 s2c s1upd2025 s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2upd202503: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+ERROR:  could not serialize access due to concurrent update
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-03-01)| 5.00
+[1,2)|[2025-03-01,2025-04-01)|10.00
+[1,2)|[2025-04-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1ser s2ser s1q s2upd20252026 s2c s1upd2025 s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2upd20252026: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+ERROR:  could not serialize access due to concurrent update
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-06-01)| 5.00
+[1,2)|[2025-06-01,2026-06-01)|10.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1ser s2ser s1q s1upd2025 s1c s2upd2027 s2c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2upd2027: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2027-01-01)| 5.00
+[1,2)|[2027-01-01,2028-01-01)|10.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(5 rows)
+
+
+starting permutation: s1ser s2ser s1q s1upd2025 s1c s2upd202503 s2c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2upd202503: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2025-03-01)| 8.00
+[1,2)|[2025-03-01,2025-04-01)|10.00
+[1,2)|[2025-04-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(5 rows)
+
+
+starting permutation: s1ser s2ser s1q s1upd2025 s1c s2upd20252026 s2c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2upd20252026: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2025-06-01)| 8.00
+[1,2)|[2025-06-01,2026-01-01)|10.00
+[1,2)|[2026-01-01,2026-06-01)|10.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(5 rows)
+
+
+starting permutation: s1ser s2ser s1q s2upd2027 s1upd2025 s2c s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2upd2027: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1upd2025: <... completed>
+ERROR:  could not serialize access due to concurrent update
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2027-01-01)| 5.00
+[1,2)|[2027-01-01,2028-01-01)|10.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1ser s2ser s1q s2upd202503 s1upd2025 s2c s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2upd202503: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1upd2025: <... completed>
+ERROR:  could not serialize access due to concurrent update
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-03-01)| 5.00
+[1,2)|[2025-03-01,2025-04-01)|10.00
+[1,2)|[2025-04-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1ser s2ser s1q s2upd20252026 s1upd2025 s2c s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2upd20252026: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1upd2025: <... completed>
+ERROR:  could not serialize access due to concurrent update
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-06-01)| 5.00
+[1,2)|[2025-06-01,2026-06-01)|10.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1ser s2ser s2del2027 s2c s1upd2025 s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2del2027: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2027-01-01)| 5.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(4 rows)
+
+
+starting permutation: s1ser s2ser s2del202503 s2c s1upd2025 s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2del202503: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2025-03-01)| 8.00
+[1,2)|[2025-04-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(4 rows)
+
+
+starting permutation: s1ser s2ser s2del20252026 s2c s1upd2025 s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2del20252026: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2025-06-01)| 8.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1ser s2ser s1upd2025 s1c s2del2027 s2c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2del2027: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2027-01-01)| 5.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(4 rows)
+
+
+starting permutation: s1ser s2ser s1upd2025 s1c s2del202503 s2c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2del202503: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2025-03-01)| 8.00
+[1,2)|[2025-04-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(4 rows)
+
+
+starting permutation: s1ser s2ser s1upd2025 s1c s2del20252026 s2c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2del20252026: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2025-06-01)| 8.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1ser s2ser s2del2027 s1upd2025 s2c s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2del2027: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  WHERE id = '[1,2)';
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1upd2025: <... completed>
+ERROR:  could not serialize access due to concurrent delete
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2027-01-01)| 5.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1ser s2ser s2del202503 s1upd2025 s2c s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2del202503: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  WHERE id = '[1,2)';
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1upd2025: <... completed>
+ERROR:  could not serialize access due to concurrent delete
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-03-01)| 5.00
+[1,2)|[2025-04-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1ser s2ser s2del20252026 s1upd2025 s2c s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2del20252026: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  WHERE id = '[1,2)';
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1upd2025: <... completed>
+ERROR:  could not serialize access due to concurrent delete
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-06-01)| 5.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1ser s2ser s1q s2del2027 s2c s1upd2025 s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2del2027: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+ERROR:  could not serialize access due to concurrent delete
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2027-01-01)| 5.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1ser s2ser s1q s2del202503 s2c s1upd2025 s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2del202503: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+ERROR:  could not serialize access due to concurrent delete
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-03-01)| 5.00
+[1,2)|[2025-04-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1ser s2ser s1q s2del20252026 s2c s1upd2025 s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2del20252026: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+ERROR:  could not serialize access due to concurrent delete
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-06-01)| 5.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1ser s2ser s1q s1upd2025 s1c s2del2027 s2c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2del2027: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2027-01-01)| 5.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(4 rows)
+
+
+starting permutation: s1ser s2ser s1q s1upd2025 s1c s2del202503 s2c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2del202503: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2025-03-01)| 8.00
+[1,2)|[2025-04-01,2026-01-01)| 8.00
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(4 rows)
+
+
+starting permutation: s1ser s2ser s1q s1upd2025 s1c s2del20252026 s2c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2del20252026: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2025-01-01,2025-06-01)| 8.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1ser s2ser s1q s2del2027 s1upd2025 s2c s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2del2027: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  WHERE id = '[1,2)';
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1upd2025: <... completed>
+ERROR:  could not serialize access due to concurrent delete
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2027-01-01)| 5.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1ser s2ser s1q s2del202503 s1upd2025 s2c s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2del202503: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  WHERE id = '[1,2)';
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1upd2025: <... completed>
+ERROR:  could not serialize access due to concurrent delete
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-03-01)| 5.00
+[1,2)|[2025-04-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1ser s2ser s1q s2del20252026 s1upd2025 s2c s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2del20252026: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  WHERE id = '[1,2)';
+
+step s1upd2025: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1upd2025: <... completed>
+ERROR:  could not serialize access due to concurrent delete
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-06-01)| 5.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1ser s2ser s2upd2027 s2c s1del2025 s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2upd2027: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2027-01-01)| 5.00
+[1,2)|[2027-01-01,2028-01-01)|10.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(4 rows)
+
+
+starting permutation: s1ser s2ser s2upd202503 s2c s1del2025 s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2upd202503: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1ser s2ser s2upd20252026 s2c s1del2025 s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2upd20252026: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2026-06-01)|10.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1ser s2ser s1del2025 s1c s2upd2027 s2c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2upd2027: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2027-01-01)| 5.00
+[1,2)|[2027-01-01,2028-01-01)|10.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(4 rows)
+
+
+starting permutation: s1ser s2ser s1del2025 s1c s2upd202503 s2c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2upd202503: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1ser s2ser s1del2025 s1c s2upd20252026 s2c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2upd20252026: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2026-06-01)|10.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1ser s2ser s2upd2027 s1del2025 s2c s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2upd2027: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1del2025: <... completed>
+ERROR:  could not serialize access due to concurrent update
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2027-01-01)| 5.00
+[1,2)|[2027-01-01,2028-01-01)|10.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1ser s2ser s2upd202503 s1del2025 s2c s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2upd202503: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1del2025: <... completed>
+ERROR:  could not serialize access due to concurrent update
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-03-01)| 5.00
+[1,2)|[2025-03-01,2025-04-01)|10.00
+[1,2)|[2025-04-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1ser s2ser s2upd20252026 s1del2025 s2c s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2upd20252026: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1del2025: <... completed>
+ERROR:  could not serialize access due to concurrent update
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-06-01)| 5.00
+[1,2)|[2025-06-01,2026-06-01)|10.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1ser s2ser s1q s2upd2027 s2c s1del2025 s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2upd2027: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+ERROR:  could not serialize access due to concurrent update
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2027-01-01)| 5.00
+[1,2)|[2027-01-01,2028-01-01)|10.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1ser s2ser s1q s2upd202503 s2c s1del2025 s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2upd202503: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+ERROR:  could not serialize access due to concurrent update
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-03-01)| 5.00
+[1,2)|[2025-03-01,2025-04-01)|10.00
+[1,2)|[2025-04-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1ser s2ser s1q s2upd20252026 s2c s1del2025 s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2upd20252026: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+ERROR:  could not serialize access due to concurrent update
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-06-01)| 5.00
+[1,2)|[2025-06-01,2026-06-01)|10.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1ser s2ser s1q s1del2025 s1c s2upd2027 s2c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2upd2027: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2027-01-01)| 5.00
+[1,2)|[2027-01-01,2028-01-01)|10.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(4 rows)
+
+
+starting permutation: s1ser s2ser s1q s1del2025 s1c s2upd202503 s2c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2upd202503: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1ser s2ser s1q s1del2025 s1c s2upd20252026 s2c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2upd20252026: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2026-06-01)|10.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1ser s2ser s1q s2upd2027 s1del2025 s2c s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2upd2027: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1del2025: <... completed>
+ERROR:  could not serialize access due to concurrent update
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2027-01-01)| 5.00
+[1,2)|[2027-01-01,2028-01-01)|10.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1ser s2ser s1q s2upd202503 s1del2025 s2c s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2upd202503: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1del2025: <... completed>
+ERROR:  could not serialize access due to concurrent update
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-03-01)| 5.00
+[1,2)|[2025-03-01,2025-04-01)|10.00
+[1,2)|[2025-04-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1ser s2ser s1q s2upd20252026 s1del2025 s2c s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2upd20252026: 
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1del2025: <... completed>
+ERROR:  could not serialize access due to concurrent update
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-06-01)| 5.00
+[1,2)|[2025-06-01,2026-06-01)|10.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1ser s2ser s2del2027 s2c s1del2025 s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2del2027: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2027-01-01)| 5.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1ser s2ser s2del202503 s2c s1del2025 s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2del202503: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1ser s2ser s2del20252026 s2c s1del2025 s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2del20252026: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1ser s2ser s1del2025 s1c s2del2027 s2c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2del2027: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2027-01-01)| 5.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1ser s2ser s1del2025 s1c s2del202503 s2c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2del202503: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1ser s2ser s1del2025 s1c s2del20252026 s2c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2del20252026: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1ser s2ser s2del2027 s1del2025 s2c s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2del2027: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  WHERE id = '[1,2)';
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1del2025: <... completed>
+ERROR:  could not serialize access due to concurrent delete
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2027-01-01)| 5.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1ser s2ser s2del202503 s1del2025 s2c s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2del202503: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  WHERE id = '[1,2)';
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1del2025: <... completed>
+ERROR:  could not serialize access due to concurrent delete
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-03-01)| 5.00
+[1,2)|[2025-04-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1ser s2ser s2del20252026 s1del2025 s2c s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2del20252026: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  WHERE id = '[1,2)';
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1del2025: <... completed>
+ERROR:  could not serialize access due to concurrent delete
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-06-01)| 5.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1ser s2ser s1q s2del2027 s2c s1del2025 s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2del2027: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+ERROR:  could not serialize access due to concurrent delete
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2027-01-01)| 5.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1ser s2ser s1q s2del202503 s2c s1del2025 s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2del202503: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+ERROR:  could not serialize access due to concurrent delete
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-03-01)| 5.00
+[1,2)|[2025-04-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1ser s2ser s1q s2del20252026 s2c s1del2025 s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2del20252026: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+ERROR:  could not serialize access due to concurrent delete
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-06-01)| 5.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1ser s2ser s1q s1del2025 s1c s2del2027 s2c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2del2027: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2027-01-01)| 5.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(3 rows)
+
+
+starting permutation: s1ser s2ser s1q s1del2025 s1c s2del202503 s2c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2del202503: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-01-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1ser s2ser s1q s1del2025 s1c s2del20252026 s2c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+
+step s1c: COMMIT;
+step s2del20252026: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  WHERE id = '[1,2)';
+
+step s2c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-01-01)| 5.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1ser s2ser s1q s2del2027 s1del2025 s2c s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2del2027: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  WHERE id = '[1,2)';
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1del2025: <... completed>
+ERROR:  could not serialize access due to concurrent delete
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2027-01-01)| 5.00
+[1,2)|[2028-01-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1ser s2ser s1q s2del202503 s1del2025 s2c s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2del202503: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  WHERE id = '[1,2)';
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1del2025: <... completed>
+ERROR:  could not serialize access due to concurrent delete
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-03-01)| 5.00
+[1,2)|[2025-04-01,2030-01-01)| 5.00
+(2 rows)
+
+
+starting permutation: s1ser s2ser s1q s2del20252026 s1del2025 s2c s1c s1q
+step s1ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s2ser: BEGIN ISOLATION LEVEL SERIALIZABLE;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2030-01-01)| 5.00
+(1 row)
+
+step s2del20252026: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  WHERE id = '[1,2)';
+
+step s1del2025: 
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+ <waiting ...>
+step s2c: COMMIT;
+step s1del2025: <... completed>
+ERROR:  could not serialize access due to concurrent delete
+step s1c: COMMIT;
+step s1q: SELECT * FROM products ORDER BY id, valid_at;
+id   |valid_at               |price
+-----+-----------------------+-----
+[1,2)|[2020-01-01,2025-06-01)| 5.00
+[1,2)|[2026-06-01,2030-01-01)| 5.00
+(2 rows)
+
diff --git a/src/test/isolation/isolation_schedule b/src/test/isolation/isolation_schedule
index 5afae33d370..87bbbcabad1 100644
--- a/src/test/isolation/isolation_schedule
+++ b/src/test/isolation/isolation_schedule
@@ -120,3 +120,4 @@ test: serializable-parallel-2
 test: serializable-parallel-3
 test: matview-write-skew
 test: lock-nowait
+test: for-portion-of
diff --git a/src/test/isolation/specs/for-portion-of.spec b/src/test/isolation/specs/for-portion-of.spec
new file mode 100644
index 00000000000..77656d38ac6
--- /dev/null
+++ b/src/test/isolation/specs/for-portion-of.spec
@@ -0,0 +1,751 @@
+# UPDATE/DELETE FOR PORTION OF test
+#
+# Test inserting temporal leftovers from a FOR PORTION OF update/delete.
+#
+# In READ COMMITTED mode, concurrent updates/deletes to the same records cause
+# weird results. Portions of history that should have been updated/deleted don't
+# get changed. That's because the leftovers from one operation are added too
+# late to be seen by the other. EvalPlanQual will reload the changed-in-common
+# row, but it won't re-scan to find new leftovers.
+#
+# MariaDB similarly gives undesirable results in READ COMMITTED mode (although
+# not the same results). DB2 doesn't have READ COMMITTED, but it gives correct
+# results at all levels, in particular READ STABILITY (which seems closest).
+#
+# A workaround is to lock the part of history you want before changing it (using
+# SELECT FOR UPDATE). That way the search for rows is late enough to see
+# leftovers from the other session(s). This shouldn't impose any new deadlock
+# risks, since the locks are the same as before. Adding a third/fourth/etc.
+# connection also doesn't change the semantics. The READ COMMITTED tests here
+# use that approach to prove that it's viable and isn't vitiated by any bugs.
+# Incidentally, this approach also works in MariaDB.
+#
+# We run the same tests under REPEATABLE READ and SERIALIZABLE.
+# In general they do what you'd want with no explicit locking required, but some
+# orderings raise a concurrent update/delete failure (as expected). If there is
+# a prior read by s1, concurrent update/delete failures are more common.
+#
+# We test updates where s2 updates history that is:
+#
+# - non-overlapping with s1,
+# - contained entirely in s1,
+# - partly contained in s1.
+#
+# We don't need to test where s2 entirely contains s1 because of symmetry:
+# we test both when s1 precedes s2 and when s2 precedes s1,  so that scenario is
+# covered.
+#
+# We test various orderings of the update/delete/commit from s1 and s2.
+# Note that `s1lock s2lock s1change` is boring because it's the same as
+# `s1lock s1change s2lock`. In other words it doesn't matter if something
+# interposes between the lock and its change (as long as everyone is following
+# the same policy).
+
+setup
+{
+  CREATE TABLE products (
+	id int4range NOT NULL,
+	valid_at daterange NOT NULL,
+	price decimal NOT NULL,
+	PRIMARY KEY (id, valid_at WITHOUT OVERLAPS));
+  INSERT INTO products VALUES
+	('[1,2)', '[2020-01-01,2030-01-01)', 5.00);
+}
+
+teardown { DROP TABLE products; }
+
+session s1
+setup		{ SET datestyle TO ISO, YMD; }
+step s1rc	{ BEGIN ISOLATION LEVEL READ COMMITTED; }
+step s1rr	{ BEGIN ISOLATION LEVEL REPEATABLE READ; }
+step s1ser	{ BEGIN ISOLATION LEVEL SERIALIZABLE; }
+step s1lock2025 {
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-01-01,2026-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+}
+step s1upd2025	{
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  SET price = 8.00
+  WHERE id = '[1,2)';
+}
+step s1del2025 {
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-01-01' TO '2026-01-01'
+  WHERE id = '[1,2)';
+}
+step s1q	{ SELECT * FROM products ORDER BY id, valid_at; }
+step s1c	{ COMMIT; }
+
+session s2
+setup		{ SET datestyle TO ISO, YMD; }
+step s2rc	{ BEGIN ISOLATION LEVEL READ COMMITTED; }
+step s2rr	{ BEGIN ISOLATION LEVEL REPEATABLE READ; }
+step s2ser	{ BEGIN ISOLATION LEVEL SERIALIZABLE; }
+step s2lock202503 {
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-03-01,2025-04-01)'
+  ORDER BY valid_at FOR UPDATE;
+}
+step s2lock20252026 {
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2025-06-01,2026-06-01)'
+  ORDER BY valid_at FOR UPDATE;
+}
+step s2lock2027 {
+  SELECT * FROM products
+  WHERE id = '[1,2)' AND valid_at && '[2027-01-01,2028-01-01)'
+  ORDER BY valid_at FOR UPDATE;
+}
+step s2upd202503 {
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+}
+step s2upd20252026 {
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+}
+step s2upd2027 {
+  UPDATE products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  SET price = 10.00
+  WHERE id = '[1,2)';
+}
+step s2del202503 {
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-03-01' TO '2025-04-01'
+  WHERE id = '[1,2)';
+}
+step s2del20252026 {
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2025-06-01' TO '2026-06-01'
+  WHERE id = '[1,2)';
+}
+step s2del2027 {
+  DELETE FROM products
+  FOR PORTION OF valid_at FROM '2027-01-01' TO '2028-01-01'
+  WHERE id = '[1,2)';
+}
+step s2c	{ COMMIT; }
+
+# ########################################
+# READ COMMITTED tests, UPDATE+UPDATE:
+# ########################################
+
+# s1 sees the leftovers
+permutation s1rc s2rc s2lock2027 s2upd2027 s2c s1lock2025 s1upd2025 s1c s1q
+
+# s1 reloads the updated row and sees its leftovers
+permutation s1rc s2rc s2lock202503 s2upd202503 s2c s1lock2025 s1upd2025 s1c s1q
+
+# s1 reloads the updated row and sees its leftovers
+permutation s1rc s2rc s2lock20252026 s2upd20252026 s2c s1lock2025 s1upd2025 s1c s1q
+
+# s2 sees the leftovers
+permutation s1rc s2rc s1lock2025 s1upd2025 s1c s2lock2027 s2upd2027 s2c s1q
+
+# s2 loads the updated row
+permutation s1rc s2rc s1lock2025 s1upd2025 s1c s2lock202503 s2upd202503 s2c s1q
+
+# s2 loads the updated row and sees its leftovers
+permutation s1rc s2rc s1lock2025 s1upd2025 s1c s2lock20252026 s2upd20252026 s2c s1q
+
+# s1 updates the leftovers from s2
+# Locking is required or s1 won't see the leftovers.
+permutation s1rc s2rc s2lock2027 s2upd2027 s1lock2025 s2c s1upd2025 s1c s1q
+
+# s1 overwrites the row from s2 and sees its leftovers
+# Locking is required or s1 won't see the leftovers.
+permutation s1rc s2rc s2lock202503 s2upd202503 s1lock2025 s2c s1upd2025 s1c s1q
+
+# s1 overwrites the row from s2 and sees its leftovers
+# Locking is required or s1 won't see the leftovers.
+permutation s1rc s2rc s2lock20252026 s2upd20252026 s1lock2025 s2c s1upd2025 s1c s1q
+
+# ########################################
+# READ COMMITTED tests, UPDATE+DELETE:
+# ########################################
+
+# s1 sees the leftovers
+permutation s1rc s2rc s2lock2027 s2del2027 s2c s1lock2025 s1upd2025 s1c s1q
+
+# s1 ignores the deleted row and sees its leftovers
+permutation s1rc s2rc s2lock202503 s2del202503 s2c s1lock2025 s1upd2025 s1c s1q
+
+# s1 ignores the deleted row and sees its leftovers
+permutation s1rc s2rc s2lock20252026 s2del20252026 s2c s1lock2025 s1upd2025 s1c s1q
+
+# s2 sees the leftovers
+permutation s1rc s2rc s1lock2025 s1upd2025 s1c s2lock2027 s2del2027 s2c s1q
+
+# s2 loads the updated row
+permutation s1rc s2rc s1lock2025 s1upd2025 s1c s2lock202503 s2del202503 s2c s1q
+
+# s2 loads the updated row and sees its leftovers
+permutation s1rc s2rc s1lock2025 s1upd2025 s1c s2lock20252026 s2del20252026 s2c s1q
+
+# s1 updates the leftovers from s2
+# Locking is required or s1 won't see the leftovers.
+permutation s1rc s2rc s2lock2027 s2del2027 s1lock2025 s2c s1upd2025 s1c s1q
+
+# s1 sees the leftovers from s2
+# Locking is required or s1 won't see the leftovers.
+permutation s1rc s2rc s2lock202503 s2del202503 s1lock2025 s2c s1upd2025 s1c s1q
+
+# s1 sees the leftovers from s2
+# Locking is required or s1 won't see the leftovers.
+permutation s1rc s2rc s2lock20252026 s2del20252026 s1lock2025 s2c s1upd2025 s1c s1q
+
+# ########################################
+# READ COMMITTED tests, DELETE+UPDATE:
+# ########################################
+
+# s1 sees the leftovers
+permutation s1rc s2rc s2lock2027 s2upd2027 s2c s1lock2025 s1del2025 s1c s1q
+
+# s1 reloads the updated row and sees its leftovers
+permutation s1rc s2rc s2lock202503 s2upd202503 s2c s1lock2025 s1del2025 s1c s1q
+
+# s1 reloads the updated row and sees its leftovers
+permutation s1rc s2rc s2lock20252026 s2upd20252026 s2c s1lock2025 s1del2025 s1c s1q
+
+# s2 sees the leftovers
+permutation s1rc s2rc s1lock2025 s1del2025 s1c s2lock2027 s2upd2027 s2c s1q
+
+# s2 ignores the deleted row
+permutation s1rc s2rc s1lock2025 s1del2025 s1c s2lock202503 s2upd202503 s2c s1q
+
+# s2 ignores the deleted row and sees its leftovers
+permutation s1rc s2rc s1lock2025 s1del2025 s1c s2lock20252026 s2upd20252026 s2c s1q
+
+# s1 deletes the leftovers from s2
+# Locking is required or s1 won't see the leftovers.
+permutation s1rc s2rc s2lock2027 s2upd2027 s1lock2025 s2c s1del2025 s1c s1q
+
+# s1 deletes the new row from s2 and its leftovers
+# Locking is required or s1 won't see the leftovers.
+permutation s1rc s2rc s2lock202503 s2upd202503 s1lock2025 s2c s1del2025 s1c s1q
+
+# s1 deletes the new row from s2 and its leftovers
+# Locking is required or s1 won't see the leftovers.
+permutation s1rc s2rc s2lock20252026 s2upd20252026 s1lock2025 s2c s1del2025 s1c s1q
+
+# ########################################
+# READ COMMITTED tests, DELETE+DELETE:
+# ########################################
+
+# s1 sees the leftovers
+permutation s1rc s2rc s2lock2027 s2del2027 s2c s1lock2025 s1del2025 s1c s1q
+
+# s1 ignores the deleted row and sees its leftovers
+permutation s1rc s2rc s2lock202503 s2del202503 s2c s1lock2025 s1del2025 s1c s1q
+
+# s1 ignores the deleted row and sees its leftovers
+permutation s1rc s2rc s2lock20252026 s2del20252026 s2c s1lock2025 s1del2025 s1c s1q
+
+# s2 sees the leftovers
+permutation s1rc s2rc s1lock2025 s1del2025 s1c s2lock2027 s2del2027 s2c s1q
+
+# s2 ignores the deleted row
+permutation s1rc s2rc s1lock2025 s1del2025 s1c s2lock202503 s2del202503 s2c s1q
+
+# s2 ignores the deleted row and sees its leftovers
+permutation s1rc s2rc s1lock2025 s1del2025 s1c s2lock20252026 s2del20252026 s2c s1q
+
+# s1 deletes the leftovers from s2
+# Locking is required or s1 won't see the leftovers.
+permutation s1rc s2rc s2lock2027 s2del2027 s1lock2025 s2c s1del2025 s1c s1q
+
+# s1 deletes the leftovers from s2
+# Locking is required or s1 won't see the leftovers.
+permutation s1rc s2rc s2lock202503 s2del202503 s1lock2025 s2c s1del2025 s1c s1q
+
+# s1 deletes the leftovers from s2
+# Locking is required or s1 won't see the leftovers.
+permutation s1rc s2rc s2lock20252026 s2del20252026 s1lock2025 s2c s1del2025 s1c s1q
+
+# ########################################
+# REPEATABLE READ tests, UPDATE+UPDATE:
+# ########################################
+
+# s1 sees the leftovers
+permutation s1rr s2rr s2upd2027 s2c s1upd2025 s1c s1q
+
+# s1 reloads the updated row and sees its leftovers
+permutation s1rr s2rr s2upd202503 s2c s1upd2025 s1c s1q
+
+# s1 reloads the updated row and sees its leftovers
+permutation s1rr s2rr s2upd20252026 s2c s1upd2025 s1c s1q
+
+# s2 sees the leftovers
+permutation s1rr s2rr s1upd2025 s1c s2upd2027 s2c s1q
+
+# s2 loads the updated row and sees its leftovers
+permutation s1rr s2rr s1upd2025 s1c s2upd202503 s2c s1q
+
+# s2 loads the updated row and sees its leftovers
+permutation s1rr s2rr s1upd2025 s1c s2upd20252026 s2c s1q
+
+# s1 fails from concurrent update
+permutation s1rr s2rr s2upd2027 s1upd2025 s2c s1c s1q
+
+# s1 fails from concurrent update
+permutation s1rr s2rr s2upd202503 s1upd2025 s2c s1c s1q
+
+# s1 fails from concurrent update
+permutation s1rr s2rr s2upd20252026 s1upd2025 s2c s1c s1q
+
+## with prior read by s1:
+
+# s1 fails from concurrent update
+permutation s1rr s2rr s1q s2upd2027 s2c s1upd2025 s1c s1q
+
+# s1 fails from concurrent update
+permutation s1rr s2rr s1q s2upd202503 s2c s1upd2025 s1c s1q
+
+# s1 fails from concurrent update
+permutation s1rr s2rr s1q s2upd20252026 s2c s1upd2025 s1c s1q
+
+# s2 sees the leftovers
+permutation s1rr s2rr s1q s1upd2025 s1c s2upd2027 s2c s1q
+
+# s2 loads the updated row
+permutation s1rr s2rr s1q s1upd2025 s1c s2upd202503 s2c s1q
+
+# s2 loads the updated row and sees its leftovers
+permutation s1rr s2rr s1q s1upd2025 s1c s2upd20252026 s2c s1q
+
+# s1 fails from concurrent update
+permutation s1rr s2rr s1q s2upd2027 s1upd2025 s2c s1c s1q
+
+# s1 fails from concurrent update
+permutation s1rr s2rr s1q s2upd202503 s1upd2025 s2c s1c s1q
+
+# s1 fails from concurrent update
+permutation s1rr s2rr s1q s2upd20252026 s1upd2025 s2c s1c s1q
+
+# ########################################
+# REPEATABLE READ tests, UPDATE+DELETE:
+# ########################################
+
+# s1 sees the leftovers
+permutation s1rr s2rr s2del2027 s2c s1upd2025 s1c s1q
+
+# s1 ignores the deleted row and sees its leftovers
+permutation s1rr s2rr s2del202503 s2c s1upd2025 s1c s1q
+
+# s1 ignores the deleted row and sees its leftovers
+permutation s1rr s2rr s2del20252026 s2c s1upd2025 s1c s1q
+
+# s2 sees the leftovers
+permutation s1rr s2rr s1upd2025 s1c s2del2027 s2c s1q
+
+# s2 loads the updated row
+permutation s1rr s2rr s1upd2025 s1c s2del202503 s2c s1q
+
+# s2 loads the updated row and sees its leftovers
+permutation s1rr s2rr s1upd2025 s1c s2del20252026 s2c s1q
+
+# s1 fails from concurrent delete
+permutation s1rr s2rr s2del2027 s1upd2025 s2c s1c s1q
+
+# s1 fails from concurrent delete
+permutation s1rr s2rr s2del202503 s1upd2025 s2c s1c s1q
+
+# s1 fails from concurrent delete
+permutation s1rr s2rr s2del20252026 s1upd2025 s2c s1c s1q
+
+## with prior read by s1:
+
+# s1 fails from concurrent delete
+permutation s1rr s2rr s1q s2del2027 s2c s1upd2025 s1c s1q
+
+# s1 fails from concurrent delete
+permutation s1rr s2rr s1q s2del202503 s2c s1upd2025 s1c s1q
+
+# s1 fails from concurrent delete
+permutation s1rr s2rr s1q s2del20252026 s2c s1upd2025 s1c s1q
+
+# s2 sees the leftovers
+permutation s1rr s2rr s1q s1upd2025 s1c s2del2027 s2c s1q
+
+# s2 loads the updated row
+permutation s1rr s2rr s1q s1upd2025 s1c s2del202503 s2c s1q
+
+# s2 loads the updated row and sees its leftovers
+permutation s1rr s2rr s1q s1upd2025 s1c s2del20252026 s2c s1q
+
+# s1 fails from concurrent delete
+permutation s1rr s2rr s1q s2del2027 s1upd2025 s2c s1c s1q
+
+# s1 fails from concurrent delete
+permutation s1rr s2rr s1q s2del202503 s1upd2025 s2c s1c s1q
+
+# s1 fails from concurrent delete
+permutation s1rr s2rr s1q s2del20252026 s1upd2025 s2c s1c s1q
+
+# ########################################
+# REPEATABLE READ tests, DELETE+UPDATE:
+# ########################################
+
+# s1 sees the leftovers
+permutation s1rr s2rr s2upd2027 s2c s1del2025 s1c s1q
+
+# s1 reloads the updated row and sees its leftovers
+permutation s1rr s2rr s2upd202503 s2c s1del2025 s1c s1q
+
+# s1 reloads the updated row and sees its leftovers
+permutation s1rr s2rr s2upd20252026 s2c s1del2025 s1c s1q
+
+# s2 sees the leftovers
+permutation s1rr s2rr s1del2025 s1c s2upd2027 s2c s1q
+
+# s2 ignores the deleted row
+permutation s1rr s2rr s1del2025 s1c s2upd202503 s2c s1q
+
+# s2 ignores the deleted row and sees its leftovers
+permutation s1rr s2rr s1del2025 s1c s2upd20252026 s2c s1q
+
+# s1 fails from concurrent update
+permutation s1rr s2rr s2upd2027 s1del2025 s2c s1c s1q
+
+# s1 fails from concurrent update
+permutation s1rr s2rr s2upd202503 s1del2025 s2c s1c s1q
+
+# s1 fails from concurrent update
+permutation s1rr s2rr s2upd20252026 s1del2025 s2c s1c s1q
+
+## with prior read by s1:
+
+# s1 fails from concurrent update
+permutation s1rr s2rr s1q s2upd2027 s2c s1del2025 s1c s1q
+
+# s1 fails from concurrent update
+permutation s1rr s2rr s1q s2upd202503 s2c s1del2025 s1c s1q
+
+# s1 fails from concurrent update
+permutation s1rr s2rr s1q s2upd20252026 s2c s1del2025 s1c s1q
+
+# s2 sees the leftovers
+permutation s1rr s2rr s1q s1del2025 s1c s2upd2027 s2c s1q
+
+# s2 ignores the deleted row
+permutation s1rr s2rr s1q s1del2025 s1c s2upd202503 s2c s1q
+
+# s2 ignores the deleted row and sees its leftovers
+permutation s1rr s2rr s1q s1del2025 s1c s2upd20252026 s2c s1q
+
+# s1 fails from concurrent update
+permutation s1rr s2rr s1q s2upd2027 s1del2025 s2c s1c s1q
+
+# s1 fails from concurrent update
+permutation s1rr s2rr s1q s2upd202503 s1del2025 s2c s1c s1q
+
+# s1 fails from concurrent update
+permutation s1rr s2rr s1q s2upd20252026 s1del2025 s2c s1c s1q
+
+# ########################################
+# REPEATABLE READ tests, DELETE+DELETE:
+# ########################################
+
+# s1 sees the leftovers
+permutation s1rr s2rr s2del2027 s2c s1del2025 s1c s1q
+
+# s1 reloads the updated row and sees its leftovers
+permutation s1rr s2rr s2del202503 s2c s1del2025 s1c s1q
+
+# s1 reloads the updated row and sees its leftovers
+permutation s1rr s2rr s2del20252026 s2c s1del2025 s1c s1q
+
+# s2 sees the leftovers
+permutation s1rr s2rr s1del2025 s1c s2del2027 s2c s1q
+
+# s2 ignores the deleted row
+permutation s1rr s2rr s1del2025 s1c s2del202503 s2c s1q
+
+# s2 ignores the deleted row and sees its leftovers
+permutation s1rr s2rr s1del2025 s1c s2del20252026 s2c s1q
+
+# s1 fails from concurrent delete
+permutation s1rr s2rr s2del2027 s1del2025 s2c s1c s1q
+
+# s1 fails from concurrent delete
+permutation s1rr s2rr s2del202503 s1del2025 s2c s1c s1q
+
+# s1 fails from concurrent delete
+permutation s1rr s2rr s2del20252026 s1del2025 s2c s1c s1q
+
+## with prior read by s1:
+
+# s1 fails from concurrent delete
+permutation s1rr s2rr s1q s2del2027 s2c s1del2025 s1c s1q
+
+# s1 fails from concurrent delete
+permutation s1rr s2rr s1q s2del202503 s2c s1del2025 s1c s1q
+
+# s1 fails from concurrent delete
+permutation s1rr s2rr s1q s2del20252026 s2c s1del2025 s1c s1q
+
+# s2 sees the leftovers
+permutation s1rr s2rr s1q s1del2025 s1c s2del2027 s2c s1q
+
+# s2 ignores the deleted row
+permutation s1rr s2rr s1q s1del2025 s1c s2del202503 s2c s1q
+
+# s2 ignores the deleted row and sees its leftovers
+permutation s1rr s2rr s1q s1del2025 s1c s2del20252026 s2c s1q
+
+# s1 fails from concurrent delete
+permutation s1rr s2rr s1q s2del2027 s1del2025 s2c s1c s1q
+
+# s1 fails from concurrent delete
+permutation s1rr s2rr s1q s2del202503 s1del2025 s2c s1c s1q
+
+# s1 fails from concurrent delete
+permutation s1rr s2rr s1q s2del20252026 s1del2025 s2c s1c s1q
+
+# ########################################
+# SERIALIZABLE tests, UPDATE+UPDATE:
+# ########################################
+
+# s1 sees the leftovers
+permutation s1ser s2ser s2upd2027 s2c s1upd2025 s1c s1q
+
+# s1 reloads the updated row and sees its leftovers
+permutation s1ser s2ser s2upd202503 s2c s1upd2025 s1c s1q
+
+# s1 reloads the updated row and sees its leftovers
+permutation s1ser s2ser s2upd20252026 s2c s1upd2025 s1c s1q
+
+# s2 sees the leftovers
+permutation s1ser s2ser s1upd2025 s1c s2upd2027 s2c s1q
+
+# s2 loads the updated row
+permutation s1ser s2ser s1upd2025 s1c s2upd202503 s2c s1q
+
+# s2 loads the updated row and sees its leftovers
+permutation s1ser s2ser s1upd2025 s1c s2upd20252026 s2c s1q
+
+# s1 fails from concurrent update
+permutation s1ser s2ser s2upd2027 s1upd2025 s2c s1c s1q
+
+# s1 fails from concurrent update
+permutation s1ser s2ser s2upd202503 s1upd2025 s2c s1c s1q
+
+# s1 fails from concurrent update
+permutation s1ser s2ser s2upd20252026 s1upd2025 s2c s1c s1q
+
+## with prior read by s1:
+
+# s1 fails from concurrent update
+permutation s1ser s2ser s1q s2upd2027 s2c s1upd2025 s1c s1q
+
+# s1 fails from concurrent update
+permutation s1ser s2ser s1q s2upd202503 s2c s1upd2025 s1c s1q
+
+# s1 fails from concurrent update
+permutation s1ser s2ser s1q s2upd20252026 s2c s1upd2025 s1c s1q
+
+# s2 sees the leftovers
+permutation s1ser s2ser s1q s1upd2025 s1c s2upd2027 s2c s1q
+
+# s2 loads the updated row
+permutation s1ser s2ser s1q s1upd2025 s1c s2upd202503 s2c s1q
+
+# s2 loads the updated row and sees its leftovers
+permutation s1ser s2ser s1q s1upd2025 s1c s2upd20252026 s2c s1q
+
+# s1 fails from concurrent update
+permutation s1ser s2ser s1q s2upd2027 s1upd2025 s2c s1c s1q
+
+# s1 fails from concurrent update
+permutation s1ser s2ser s1q s2upd202503 s1upd2025 s2c s1c s1q
+
+# s1 fails from concurrent update
+permutation s1ser s2ser s1q s2upd20252026 s1upd2025 s2c s1c s1q
+
+# ########################################
+# SERIALIZABLE tests, UPDATE+DELETE:
+# ########################################
+
+# s1 sees the leftovers
+permutation s1ser s2ser s2del2027 s2c s1upd2025 s1c s1q
+
+# s1 ignores the deleted row and sees its leftovers
+permutation s1ser s2ser s2del202503 s2c s1upd2025 s1c s1q
+
+# s1 ignores the deleted row and sees its leftovers
+permutation s1ser s2ser s2del20252026 s2c s1upd2025 s1c s1q
+
+# s2 sees the leftovers
+permutation s1ser s2ser s1upd2025 s1c s2del2027 s2c s1q
+
+# s2 loads the updated row
+permutation s1ser s2ser s1upd2025 s1c s2del202503 s2c s1q
+
+# s2 loads the updated row and sees its leftovers
+permutation s1ser s2ser s1upd2025 s1c s2del20252026 s2c s1q
+
+# s1 fails from concurrent delete
+permutation s1ser s2ser s2del2027 s1upd2025 s2c s1c s1q
+
+# s1 fails from concurrent delete
+permutation s1ser s2ser s2del202503 s1upd2025 s2c s1c s1q
+
+# s1 fails from concurrent delete
+permutation s1ser s2ser s2del20252026 s1upd2025 s2c s1c s1q
+
+## with prior read by s1:
+
+# s1 fails from concurrent delete
+permutation s1ser s2ser s1q s2del2027 s2c s1upd2025 s1c s1q
+
+# s1 fails from concurrent delete
+permutation s1ser s2ser s1q s2del202503 s2c s1upd2025 s1c s1q
+
+# s1 fails from concurrent delete
+permutation s1ser s2ser s1q s2del20252026 s2c s1upd2025 s1c s1q
+
+# s2 sees the leftovers
+permutation s1ser s2ser s1q s1upd2025 s1c s2del2027 s2c s1q
+
+# s2 loads the updated row
+permutation s1ser s2ser s1q s1upd2025 s1c s2del202503 s2c s1q
+
+# s2 loads the updated row and sees its leftovers
+permutation s1ser s2ser s1q s1upd2025 s1c s2del20252026 s2c s1q
+
+# s1 fails from concurrent delete
+permutation s1ser s2ser s1q s2del2027 s1upd2025 s2c s1c s1q
+
+# s1 fails from concurrent delete
+permutation s1ser s2ser s1q s2del202503 s1upd2025 s2c s1c s1q
+
+# s1 fails from concurrent delete
+permutation s1ser s2ser s1q s2del20252026 s1upd2025 s2c s1c s1q
+
+# ########################################
+# SERIALIZABLE tests, DELETE+UPDATE:
+# ########################################
+
+# s1 sees the leftovers
+permutation s1ser s2ser s2upd2027 s2c s1del2025 s1c s1q
+
+# s1 reloads the updated row and sees its leftovers
+permutation s1ser s2ser s2upd202503 s2c s1del2025 s1c s1q
+
+# s1 reloads the updated row and sees its leftovers
+permutation s1ser s2ser s2upd20252026 s2c s1del2025 s1c s1q
+
+# s2 sees the leftovers
+permutation s1ser s2ser s1del2025 s1c s2upd2027 s2c s1q
+
+# s2 ignores the deleted row
+permutation s1ser s2ser s1del2025 s1c s2upd202503 s2c s1q
+
+# s2 ignores the deleted row and sees its leftovers
+permutation s1ser s2ser s1del2025 s1c s2upd20252026 s2c s1q
+
+# s1 fails from concurrent update
+permutation s1ser s2ser s2upd2027 s1del2025 s2c s1c s1q
+
+# s1 fails from concurrent update
+permutation s1ser s2ser s2upd202503 s1del2025 s2c s1c s1q
+
+# s1 fails from concurrent update
+permutation s1ser s2ser s2upd20252026 s1del2025 s2c s1c s1q
+
+## with prior read by s1:
+
+# s1 fails from concurrent update
+permutation s1ser s2ser s1q s2upd2027 s2c s1del2025 s1c s1q
+
+# s1 fails from concurrent update
+permutation s1ser s2ser s1q s2upd202503 s2c s1del2025 s1c s1q
+
+# s1 fails from concurrent update
+permutation s1ser s2ser s1q s2upd20252026 s2c s1del2025 s1c s1q
+
+# s2 sees the leftovers
+permutation s1ser s2ser s1q s1del2025 s1c s2upd2027 s2c s1q
+
+# s2 ignores the deleted row
+permutation s1ser s2ser s1q s1del2025 s1c s2upd202503 s2c s1q
+
+# s2 ignores the deleted row and sees its leftovers
+permutation s1ser s2ser s1q s1del2025 s1c s2upd20252026 s2c s1q
+
+# s1 fails from concurrent update
+permutation s1ser s2ser s1q s2upd2027 s1del2025 s2c s1c s1q
+
+# s1 fails from concurrent update
+permutation s1ser s2ser s1q s2upd202503 s1del2025 s2c s1c s1q
+
+# s1 fails from concurrent update
+permutation s1ser s2ser s1q s2upd20252026 s1del2025 s2c s1c s1q
+
+# ########################################
+# SERIALIZABLE tests, DELETE+DELETE:
+# ########################################
+
+# s1 sees the leftovers
+permutation s1ser s2ser s2del2027 s2c s1del2025 s1c s1q
+
+# s1 ignores the deleted row and sees its leftovers
+permutation s1ser s2ser s2del202503 s2c s1del2025 s1c s1q
+
+# s1 ignores the deleted row and sees its leftovers
+permutation s1ser s2ser s2del20252026 s2c s1del2025 s1c s1q
+
+# s2 sees the leftovers
+permutation s1ser s2ser s1del2025 s1c s2del2027 s2c s1q
+
+# s2 ignores the deleted row
+permutation s1ser s2ser s1del2025 s1c s2del202503 s2c s1q
+
+# s2 ignores the deleted row and sees its leftovers
+permutation s1ser s2ser s1del2025 s1c s2del20252026 s2c s1q
+
+# s1 fails from concurrent delete
+permutation s1ser s2ser s2del2027 s1del2025 s2c s1c s1q
+
+# s1 fails from concurrent delete
+permutation s1ser s2ser s2del202503 s1del2025 s2c s1c s1q
+
+# s1 fails from concurrent delete
+permutation s1ser s2ser s2del20252026 s1del2025 s2c s1c s1q
+
+# with prior read by s1:
+
+# s1 fails from concurrent delete
+permutation s1ser s2ser s1q s2del2027 s2c s1del2025 s1c s1q
+
+# s1 fails from concurrent delete
+permutation s1ser s2ser s1q s2del202503 s2c s1del2025 s1c s1q
+
+# s1 fails from concurrent delete
+permutation s1ser s2ser s1q s2del20252026 s2c s1del2025 s1c s1q
+
+# s2 sees the leftovers
+permutation s1ser s2ser s1q s1del2025 s1c s2del2027 s2c s1q
+
+# s2 ignores the deleted row
+permutation s1ser s2ser s1q s1del2025 s1c s2del202503 s2c s1q
+
+# s2 ignores the deleted row and sees its leftovers
+permutation s1ser s2ser s1q s1del2025 s1c s2del20252026 s2c s1q
+
+# s1 fails from concurrent delete
+permutation s1ser s2ser s1q s2del2027 s1del2025 s2c s1c s1q
+
+# s1 fails from concurrent delete
+permutation s1ser s2ser s1q s2del202503 s1del2025 s2c s1c s1q
+
+# s1 fails from concurrent delete
+permutation s1ser s2ser s1q s2del20252026 s1del2025 s2c s1c s1q
+
-- 
2.39.5