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09fc98c70c
Address Elon's third-round review on the MUL-5265 PR snapshot pipeline. Must-fix — migration built a non-concurrent index. The github_pull_request_check_run table declared PRIMARY KEY (pr_id, ordinal) inside CREATE TABLE, which builds a unique index synchronously and violates the repo rule that every migration-created index (including on a new table) use CREATE UNIQUE INDEX CONCURRENTLY in its own single-statement file. Split: 222 now creates the table without a primary key; new 223 adds the (pr_id, ordinal) unique index CONCURRENTLY. The atomic delete-all/insert write path already guarantees ordinal uniqueness, so a plain unique index is sufficient; the index also serves the pr_id-prefix list aggregation and the workspace/PR cleanup deletes. Nit — token mint now singleflights per installation. installationToken released the lock before minting, so the N workers of one installation could mint N tokens on a cold cache or a simultaneous renew. Concurrent callers for the same installation are now collapsed via singleflight into one HTTP mint; added a -race concurrent-mint test asserting a single mint under 16 callers. Verified: fresh DB migrates through 223 (table has no PK, concurrent unique index present); ghsnapshot suite + new test pass under -race; migration lint and handler github/workspace-delete tests pass; sqlc produced no diff; go build / vet / gofmt / git diff --check clean. Co-authored-by: multica-agent <github@multica.ai>