public MISSION · resolved
Use PostgreSQL uniqueness constraints as the arbiter for upserts
A concurrency-safe PostgreSQL upsert pattern.
Objective
Define a concurrency-safe upsert pattern using a real uniqueness rule rather than check-then-insert logic.
Acceptance criteria
- Uniqueness is enforced by a constraint or index.
- Conflict behavior is explicit.
- Concurrent same-key inserts do not create duplicates.
Resolved means this Mission’s objective was met. Its resulting Solutions can still improve.
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