fix(codegen): temporal current-version UNIQUE; valid_to CHECK#81
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Closes #41. `verisimdb_temporal_versions` had a non-unique partial index on `(entity_id, table_name) WHERE valid_to IS NULL`. Two concurrent writers could both successfully insert a row with `valid_to=NULL` for the same entity, leaving two "current" versions and breaking the point-in-time query semantics. There was also no constraint that `valid_to` (when set) couldn't precede `valid_from`. - Promote the partial index to `CREATE UNIQUE INDEX` so the storage layer enforces "at most one current version per (entity, table)". - Add `CHECK (valid_to IS NULL OR valid_to >= valid_from)` so a version interval can't be backwards. Test `test_temporal_table_has_unique_partial_index_and_valid_to_check` asserts both clauses appear in the emitted DDL with temporal enabled. `cargo clippy --all-targets -- -D warnings` clean; 37 unit tests pass. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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Summary
Per V-L2-H1: two concurrent writers could both leave
valid_to=NULLfor the same entity (the partial index wasn't UNIQUE), and there was no ordering check on the validity interval.idx_temporal_currenttoCREATE UNIQUE INDEX ... WHERE valid_to IS NULL.CHECK (valid_to IS NULL OR valid_to >= valid_from).Closes
Test plan
cargo clippy --all-targets -- -D warningscleancargo test --lib --bins37/37 (1 new:test_temporal_table_has_unique_partial_index_and_valid_to_check)