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168 records -> docs/decisions/records/<area>/<topic>.md (163 active, 23 dirs) and docs/decisions/archive/<area>/<topic>.md (5 archived). The filename IS the key, so one-active-record-per-key becomes a filesystem property rather than a validator check, and supersession becomes a `git mv`. WHY: the monolith was a concurrency problem before an aesthetic one. A 3,900-line append target made parallel sessions collide -- PR #605 and PR #614 both hit append-vs-append conflicts during routine rebases, and hand-resolving those inside the corpus is exactly the operation the rationale-rewrite guard exists to police. HOW IT IS VERIFIED: a ~170-file diff cannot be meaningfully read, so correctness does not rest on reading it. The parser was taught BOTH formats first, so the body-diff guard parses the old form at the merge-base and the new form at head -- the migration validates itself, no bypass. The proof is a field-level equivalence harness: 168 records before and after, zero lost, zero gained, zero field mismatches, zero rationale bodies differing. Reviewers should scrutinise the harness; it is the actual evidence. What measuring caught that reading would not have: - ~500 lines sit OUTSIDE any record -- decisions.md's lifecycle schema and each topic file's preamble, mostly the only copy. Source files are kept and stripped, never deleted. They also cannot be filed per-area: topic files hold several areas and 4 of 23 areas span several files. - Archive discovery was a non-recursive glob; after the split it found ZERO archived records, surfacing as four bogus "supersedes points to unknown key" errors rather than an obvious failure. - ~32 live docs point into the corpus BY DATE, which the split dangles. Each stripped file now ends with a generated "Records formerly in this file" index, which also rescues the identical breadcrumbs in old issue comments. - decisions.md's "In this file:" list was 97 same-file anchor bullets that the split makes WRONG, not merely stale. Dropped; the generated index replaces them with links that resolve. The equivalence harness now runs against a checked-in FIXTURE, not the live corpus. The earlier version migrated the real tree, which made it a one-shot: the moment the migration landed there was nothing left to move and the tests failed for reasons unrelated to the code. A fixture keeps them testing the SCRIPT rather than the repo's current state. Keys preserved verbatim, warts included: `sched` (12) and `scheduling` (1) remain two directories for one concept. Renaming a key is not a move -- it changes identity, breaks the equivalence proof, and invalidates MemPalace's per-key drawers. Taxonomy normalisation is separate work. refs #610
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key, title, status, since, supersedes, superseded-by, rule, signals, mechanics
| key | title | status | since | supersedes | superseded-by | rule | signals | mechanics |
|---|---|---|---|---|---|---|---|---|
| api.mediatr-passthrough | 2026-06 — REST API wraps existing MediatR handlers 1:1, no service layer | active | 2026-06 | none | none | The REST API is thin controllers over existing MediatR handlers, with no new service/business-logic layer. | CQRS passthrough, `Either<BaseError, T>` mapping, handler-level fixes not controller papering · paths: `docs/rest-api.md`, `docs/api-conventions.md` §3 · issues: #2, #172 | `docs/api-conventions.md` §3 |
The REST API (#2, docs/rest-api.md) is thin controllers over the existing MediatR
Create/Update/Delete handlers — no new service/business-logic layer was introduced, since nearly
every handler already returns Either<BaseError, T>, which maps cleanly to HTTP status codes.
Latent handler bugs (missing existence checks, KeyNotFoundException risk, etc.) are fixed at
the handler, converting what would have 500'd into a proper 404/422 — not papered over in the
controller. Established across the #2a–#2e gap-issue PRs. Deep FK ids nested inside item-list
request bodies (e.g. a schedule item's CollectionId) are deliberately not existence-checked at
that depth, to avoid N+1 validation queries — precedent set by the schedules endpoints (#172); see
docs/api-conventions.md §3 for the up-to-date statement of this rule.