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pad/internal/models
xarmian ec71903be7 feat(store): JSONB NOT NULL hardening on items/views + handler shape validation (IDEA-1486+1488) (#566)
* feat(store): NOT NULL hardening on items.fields/tags + views.config (IDEA-1486)

Paired ship of IDEA-1486 (sibling-table JSONB NOT NULL hardening) and
IDEA-1488 (handler-layer shape validation for ViewUpdate/CollectionUpdate).
Generalizes the IDEA-1484 / collections.settings precedent (PR #562) to the
remaining nullable JSON columns and closes the shape-validation gap that
NOT NULL alone doesn't cover.

Schema layer (IDEA-1486 floor):
- migrations/056_items_jsonb_not_null.sql: rebuild items with
  fields TEXT NOT NULL DEFAULT '{}' and tags TEXT NOT NULL DEFAULT '[]',
  preserving all 7 indexes, recreating the 3 items_fts triggers, and
  rebuilding the FTS5 index. Foreign-keys-off / on bookends are lifted
  outside the IDEA-1485 atomic-tx wrapper.
- migrations/057_views_config_not_null.sql: rebuild views with
  config TEXT NOT NULL DEFAULT '{}'.
- pgmigrations/035 + 036: SET NOT NULL + SET DEFAULT on the three JSONB
  columns. Split per-table to mirror the SQLite per-table file granularity.

Store layer (IDEA-1486 floor):
- items.go UpdateItem and views.go UpdateView normalize "" -> "{}" / "[]"
  before writing. Same boundary pattern as CreateItem and the IDEA-1484
  precedent at collections.go:248.
- export.go ImportWorkspace coerces empty-string AND malformed JSON at
  import time on items.fields, items.tags, and collections.settings.
  Malformed input is coerce-and-log via slog.Warn (length only, never raw
  value) so legacy bundles don't fail-stop on one bad row.
- remapFieldIDs early-returns "{}" on empty input so the second-pass
  UPDATE can't write "" verbatim.
- Migrated the existing fmt.Printf at export.go:329 to slog.Warn for
  consistency.

Handler layer (IDEA-1488 ceiling):
- ViewCreate / ViewUpdate UnmarshalJSON via flexJSONToString with new
  ErrInvalidConfigType sentinel.
- CollectionCreate / CollectionUpdate UnmarshalJSON with new
  ErrInvalidSettingsType sentinel.
- handlers_views.go and handlers_collections.go surface both sentinels
  as 400 with the domain-level message (mirrors the BUG-1144 precedent at
  handlers_items.go:641).

Tests:
- internal/store/items_views_jsonb_test.go: store-coercion + import
  coercion + log-and-coerce-on-malformed + SQLite schema introspection
  (7 indexes + 3 FTS triggers + items_fts virtual table survival) +
  Postgres NOT NULL enforcement + migration re-apply idempotency +
  item_links round-trip after rebuild.
- internal/server/handlers_views_collections_jsonb_test.go: PATCH/POST
  flexible-shape coverage for views.config and collections.settings,
  including domain-level 400 message assertions that the response does
  not leak Go unmarshal internals.

Refs: IDEA-1486, IDEA-1488, IDEA-1484 (precedent), IDEA-1485 (substrate).

* fix(store,models): codex R1 follow-ups for IDEA-1486 / IDEA-1488

Three concrete defects surfaced by codex R1 against the initial paired
ship. All three close holes that defeated parts of the original contract.

P1.1: migration 056 missed the playbook invocation_slug unique index.
- migrations/056_items_jsonb_not_null.sql: recreate the partial UNIQUE
  index idx_items_invocation_slug_per_collection from migration 054
  verbatim after the other 7 indexes. Without it, the application-layer
  pre-check in handlers_items.go:checkUniqueFields would be a TOCTOU
  race with no DB-level guard — the original index that 054 explicitly
  added as the actual uniqueness backstop would be silently dropped
  during the items rebuild.
- items_views_jsonb_test.go: the schema-introspection test now asserts
  8 indexes, not 7. Verified via `grep -rn "ON items(" migrations/`
  that no other items-touching indexes were missed.

P1.2: flexJSONToString didn't validate inner content of JSON-encoded
strings. Pre-fix, `{"config": "[]"}` / `{"settings": "not json"}` /
`{"fields": "[]"}` / `{"tags": "{}"}` slipped past the shape validators
because the `case '"'` branch unmarshalled the envelope and returned
the inner string verbatim — bypassing the whole point of IDEA-1488.
- models/item.go: after unmarshalling the JSON-encoded string, validate
  that the trimmed inner content's first byte matches expectedStart
  ('{' / '[') AND parses as JSON. Empty inner strings still pass
  through to the store-layer empty-string coercion (IDEA-1486 floor),
  so legacy "" → default normalization is preserved.
- The pre-existing ItemUpdate fields/tags path inherits the same
  tightening because it routes through this helper — covered by new
  test file handlers_items_jsonb_inner_shape_test.go.
- Parallel handler tests for views.config and collections.settings
  added to handlers_views_collections_jsonb_test.go.

P2: coerceJSONForImport accepted JSON null as well-formed.
- store/export.go: json.Unmarshal("null", &m) returns err=nil with m
  staying nil; the prior code returned the raw "null" string verbatim,
  which lands as JSONB null on Postgres (satisfies NOT NULL since SQL
  NULL ≠ JSONB null) or text "null" on SQLite. The non-nil check on
  the unmarshalled value routes JSON null to the existing
  log-and-coerce path with the rest of the malformed shapes.
- items_views_jsonb_test.go: extended import test with an item
  carrying fields=null / tags=null; expects both coerced to "{}" /
  "[]" and the structured slog.Warn emitted.

Verified: make test (SQLite) and the full ./... suite against the
existing port-5445 Postgres container both pass cleanly.

Refs: IDEA-1486, IDEA-1488, codex R1 review.

* fix(store,server): codex R2 follow-ups for IDEA-1486 / IDEA-1488

Two defects surfaced by codex R2. P1 is a real ship-breaker; P2 closes
a parity gap that R1 missed.

P1: migration backfill normalized only SQL NULL, not malformed/wrong-
shape JSON.

The four new migrations originally wrote `WHERE x IS NULL`. Rows with
fields = '' / 'null' / '[]' / 'not json' all survived the filter, then
violated the post-migration NOT NULL+shape contract. Concrete ship-
breaker on SQLite: 056 recreates the partial UNIQUE index on
json_extract(fields, '$.invocation_slug') from migration 054, and
json_extract errors on rows whose fields fails json_valid — a single
bad row breaks CREATE INDEX mid-migration. Toggle-verified: with the
NULL-only WHERE, the new SQLite test fails at exactly that CREATE
INDEX with "SQL logic error: malformed JSON (1)".

Widened the backfill clauses:
- migrations/056: UPDATE items WHERE fields IS NULL OR json_valid(fields)=0
  OR json_type(fields)!='object' (same trio for tags with 'array').
- migrations/057: same trio for views.config.
- pgmigrations/035: WHERE fields IS NULL OR jsonb_typeof(fields)!='object'.
  JSONB rejects invalid JSON on write so the json_valid leg isn't
  needed on Postgres; only the shape check matters.
- pgmigrations/036: same shape check on views.config.

Regression tests in internal/store/items_views_jsonb_test.go:
- TestItemsViewsJSONB_SQLiteBackfillRepairsMalformedShapes: applies
  migrations through 053 (skipping 054 which would itself error on
  malformed rows), seeds every observable shape pathology — SQL NULL,
  empty string, JSON null literal, wrong-shape JSON, non-JSON garbage —
  then applies 055/056/057. Asserts every malformed row is repaired AND
  the partial UNIQUE index actually fires on duplicate invocation_slug
  post-rebuild (proving the CREATE INDEX path executed end-to-end).
- TestItemsViewsJSONB_PostgresBackfillRepairsMalformedShapes: parallel
  Postgres coverage; seeds JSONB null / array / primitive via direct
  ::jsonb cast and asserts the widened WHERE clause repairs each.

P2: handleCreateItem didn't unwrap ErrInvalidFieldsType/ErrInvalidTagsType.

R1's flexJSONToString tightening propagated the sentinels through every
UnmarshalJSON path, but handleCreateItem (POST /items) still returned
'invalid JSON: <wrapped>' from decodeJSON. PATCH and the view/collection
POST/PATCH handlers already unwrapped — POST was the outlier.

- internal/server/handlers_items.go: mirror the PATCH-side errors.Is
  handling at the POST path. Brief, three-line diff.
- handlers_items_jsonb_inner_shape_test.go: new TestCreateItem_
  JSONEncodedStringInnerShapeValidated covers POST with fields=`[]`,
  fields=42, tags=`{}`, tags={"x":1}, plus a valid positive control.
  Asserts no "invalid JSON:" wrapper and presence of the sentinel
  message verbatim.

Backfill-pattern audit (codex R2's grep prompt): only 055 / pg-034
(collections.settings, already shipped) exhibits the same NULL-only
WHERE gap. Per the brief: NOT touched — retroactive repair belongs to
a separate IDEA. Other NULL-only backfills (043/pg-023's
oauth_providers, 044/pg-024's expires_at) handle their respective
shapes correctly or aren't JSON columns.

Verified: make test (SQLite) clean. Full ./... suite against the
existing port-5445 Postgres container clean (one unrelated flake in
internal/collab passed on rerun).

Refs: IDEA-1486, IDEA-1488, codex R2 review.
2026-05-16 10:15:59 -04:00
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2026-03-26 01:52:36 +00:00