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ersatztv/ErsatzTV.Infrastructure.Sqlite/Migrations
timothyandClaude Opus 4.8 94ebf34ccd
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feat(api): optimistic-concurrency contract for replace-all PUTs — PR1 infra + Block reference (#253)
Adds the shared optimistic-concurrency contract so a stale second tab can no longer
silently overwrite a fresher edit. PR1 lands the infra + the Block reference aggregate;
PRs 2–4 fan the same recipe across the other 8 roots (design: #253#issuecomment-8472).

Contract
- `IVersionedAggregate` (`int Version`) on all 9 replace-all roots (ProgramSchedule,
  Block, Template, DecoTemplate, Playlist, Collection, Playout, MultiCollection,
  RerunCollection), EF-mapped `.IsConcurrencyToken()`; one dual-provider migration
  `AddAggregateVersions` (nullable:false, default 0).
- Strong `ETag` of `Version` on the aggregate GET; `If-Match` on the PUT; mismatch →
  412 (distinct from the §3a 409 build-lock guard). Successful PUT returns the new ETag.
- `PreconditionFailedError : BaseError` → 412 in `ApiResults.ToErrorResult`;
  `ConcurrencyHeaders.ParseIfMatch/SetETag`; malformed If-Match → 400; `*`/absent =
  Phase-1 force-write.

Block reference wiring
- Handler: standalone `Either` via `CheckVersion` AFTER validation (never through
  `Apply`, which Join()-flattens the subtype to 422), unconditional `Version++`,
  `SaveChangesWithConcurrencyGuard` backstop (DbUpdateConcurrencyException → 412).
- `BlockViewModel.Version` (header-only, not echoed in the body); controller sets the
  ETag on GET items and on the successful PUT.
- SPA: `client.requestWithMeta` seam; `blocks.getBlockItemsWithMeta` + `replaceBlock`
  If-Match/ETag round-trip; `BlockEditor` holds the ETag, sends If-Match, and on 412
  opens a blocking "changed elsewhere — reload" dialog.

Tests
- Handler contract tests: stale-If-Match → 412 (no mutation), matching/absent → success
  + bump, no-op save still bumps, and a two-context racing save → 412; proven
  non-vacuous (drop `.IsConcurrencyToken()` → the race test fails).
- Controller tests: malformed If-Match → 400, If-Match threaded to the command, ETag on
  GET/PUT, 412 passthrough. SPA: requestWithMeta ETag, replaceBlock If-Match, 412 dialog.

Docs: api-conventions §7a, spa-conventions §4a, domain-model glossary, decisions log.

Refs #253
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-07-11 16:51:59 +02:00
..
2023-09-03 08:52:00 -05:00