fix: reject unstorable feedback-record metadata as 400 instead of 500 - #134
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…ailing as 500 `metadata` was the only field on the create and update requests without content validation, and it could not have had it: `no_null_bytes` skips any field that is not a string kind, and `json.RawMessage` is a []byte. So the raw bytes reached the driver untouched and Postgres rejected the jsonb write, surfacing as an unmapped 500 on input the OpenAPI description already declared invalid. Add a `storable_json` tag that scans the raw JSON for the two things Postgres refuses in a jsonb value — NULL bytes and unpaired UTF-16 surrogates — in keys as well as values, and apply it to both request bodies. The scan works on the raw bytes rather than the unmarshalled value because encoding/json rewrites both cases: a NULL escape becomes a real NUL and an unpaired surrogate becomes U+FFFD, so a Go string looks storable while the bytes sent to Postgres are not. Verified against a real Hub and Postgres 18: each rejected case is a 400 whose invalid_params names `metadata`, and the same request returns 500 with SQLSTATE 22P05 once the tag is removed. Legitimate payloads are unaffected — nested objects, arrays, emoji, CJK, valid surrogate pairs, 200 keys and a 20k value all still round-trip byte-for-byte. Also rewrite the three `metadata` descriptions in the spec, which said little about what the field is for: what belongs in it, the snake_case key convention dashboards depend on, that numbers keep full precision unlike value_number, that PATCH replaces the object wholesale rather than merging, and that personal data is neither redacted nor deduplicated across a submission's records. Size bounds are deliberately left out: capping metadata would break existing direct callers, and that belongs with the rest of ENG-1652.
Review of the storable_json fix found Postgres refuses a third thing when
writing jsonb: numbers outside numeric range. Fifteen bytes of perfectly valid
JSON — {"n":1e1000000} — decode cleanly, pass every byte-level check, and fail
the insert with SQLSTATE 22003, reproducing exactly the unmapped 500 the
previous commit exists to kill. A byte scan cannot see this class: it is a
range property of the parsed value, not of the characters.
Map 22003 on both write paths to a metadata validation error. Attribution is
sound on these queries because metadata is the only place a numeric can
originate: value_number is float8 and every Go float64 fits float8.
Also from review: pin the storable_json tag on the real request structs (the
tag tests drove a local struct, so reverting only the models hunk left the
suite green), add an HTTP-level integration test covering all three rejection
classes against a real database, and correct the spec's "returned verbatim"
claim — jsonb normalizes key order and number formatting.
✱ Stainless preview buildsThis PR will update the ✅ hub-typescript studio · code
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xernobyl
marked this pull request as ready for review
September 1, 2026 12:46
WalkthroughThe change adds Merge Risk: 🔵 Low · up to The change correctly converts unstorable metadata failures into client validation errors, but the validation message should also mention invalid UTF-8 and the integration test should use a finite timeout to avoid hangs. The PR is mergeable with explicit owner follow-up on these bounded issues. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Title checkExplanation The title clearly summarizes the main change: feedback-record metadata that PostgreSQL cannot store is rejected with a 400 response instead of a 500 response. It also follows the Conventional Commits format. Full details: Description checkExplanation The description is complete and directly related to the change. It explains the motivation, affected behavior, validation and repository handling, API response changes, testing instructions, issue reference, OpenAPI updates, and checklist status. The unchecked appreciated items are non-critical. Full details: Docstring CoverageExplanation Docstring coverage is 75.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 12 functions across 6 files. (1 skipped: 1 unsupported.)
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Inline comments:
In `@internal/api/validation/validation.go`:
- Line 398: Update the validation reason returned by IsStorableJSON to mention
invalid UTF-8 alongside NULL bytes and unpaired UTF-16 surrogates, preserving
the existing validation behavior.
In `@tests/feedback_record_metadata_validation_test.go`:
- Line 26: Set a finite timeout on the http.Client used by the test instead of
leaving it as an unconfigured &http.Client, ensuring requests cannot hang
indefinitely while preserving the existing request behavior.
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📒 Files selected for processing (7)
internal/api/validation/json_storable.gointernal/api/validation/json_storable_test.gointernal/api/validation/validation.gointernal/models/feedback_records.gointernal/repository/feedback_records_repository.goopenapi.yamltests/feedback_record_metadata_validation_test.go
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…und the test client Review follow-ups: the storable_json reason told a caller whose metadata failed the UTF-8 gate to remove NULL bytes it may not have, so the message now names all three rejected classes; and the integration test's HTTP client gets a timeout so a blocked handler fails the test instead of hanging it.
…e rejects Re-review found the spec and the implementation disagreeing in three places after the numeric-overflow mapping landed: the update description still listed only NULL bytes and surrogates, neither description mentioned invalid UTF-8 (which the validator rejects and the reason string now names), and the read description promised metadata is absent when a record has none — but a record stored with an explicit JSON null returns null rather than omitting the field. Also qualify the precision claim: numbers keep full precision in storage and through this API, but a JavaScript client still loses it above 2^53 on parse. `decimalBase` named the 'a'->10 offset rather than a base; renamed.
BhagyaAmarasinghe
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2 major · 2 minor · 1 trivial · +1 pre-existing — reviewed at b0f32516a3
Checked
go build,go vet ./internal/...,go test ./internal/...— pass- 12k generated escape-soup docs: scanner verdict == pg18
::jsonb, both ways - Every jsonb numeric-range failure I could produce is SQLSTATE 22003
- PATCH on a real pg18: all three classes 400, naming
metadata - Deep nesting: Go's decoder caps below where pg's parser trips
- CodeRabbit's two comments are fixed at this head; not repeated
Findings
- 🟠 Major · tests
internal/repository/feedback_records_repository.go:966— The Update-side 22003 mapping has no test — deleting it stays green - 🟠 Major · drift
openapi.yaml:3288— Response schema forbids thenullthis description promises - 🟡 Minor · drift
openapi.yaml:3066— The new privacy paragraph is wrong on each of its three claims - 🟡 Minor · tests
tests/feedback_record_metadata_validation_test.go:108— Nothing pins the exact round-trip the spec now promises - 🔵 Trivial · drift — The body's before/after quotes a
reasonstring the code does not emit- Shown as
must not contain NULL bytes or unpaired UTF-16 surrogates;internal/api/validation/validation.go:398emitsmust contain valid UTF-8 and no NULL bytes or unpaired UTF-16 surrogates, which the new tests assert verbatim. Everything else in the block checks out.
- Shown as
- 🟠 Major · correctness · pre-existing — The same 500 still happens for invalid UTF-8 in a query param or path
- Nothing validates UTF-8 outside a JSON body —
normalizeIdentifierValue(internal/service/id_validation.go:53) andno_null_bytescheck only\x00— so raw bytes reach pgx. A body string escapes it only becauseencoding/jsonrewrites to U+FFFD. - Reproduced on pg18:
%ed%a0%bdastenant_id/source_id/user_idonGET+DELETE /v1/feedback-records,/count,GET /v1/tenants/{id}/settingsandGET /v1/webhooksall 500 withSQLSTATE 22021. - Follow-up ticket, not this PR. Same for the five
json.RawMessagefields onTaxonomyRunResultRequest(internal/models/taxonomy.go:225-255), which reach jsonb with neither the tag nor a 22003 mapping.
- Nothing validates UTF-8 outside a JSON body —
Reply per finding: the fix, why it's wrong, or a ticket.
claude-opus-5 · high
…h every metadata shape Review found the update side asserted nowhere: deleting either its validator tag or its SQLSTATE 22003 mapping left the whole suite green while PATCH regressed to a 500. It now drives all three rejection classes through PATCH, after an empty-PATCH baseline so a 400 cannot pass for "any body fails", and asserts the reason names `metadata` so an incidental 400 cannot either. The spec promised "a large integer id round-trips exactly" with nothing pinning it. Pinned — decoded with UseNumber, because through map[string]any the value reads back ...92, and assert.JSONEq would lose the same precision on both sides and pass regardless. Three schema corrections, all cases where the document forbade what the server does. The PATCH request body was the third `metadata` schema and still said `type: object`, though it accepts and returns JSON null like the other two. The response schema is now untyped: the column stores whatever JSON was written, and arrays, scalars and booleans all round-trip today, so an object-only response schema would make a generated client reject a legitimate record. The erasure sentence also failed open — it read as unconditional, but the delete matches on `user_id`, so a row written without one cannot be reached. It now says so. And metadata is contrasted with `value_text` rather than likened to it: only the latter is shipped to LLM and embedding providers.
BhagyaAmarasinghe
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Sep 2, 2026
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Requesting changes for two API-contract issues at the current head. The validator and repository mappings look correct, and the targeted POST/PATCH regression coverage passes.
…ame the webhook egress
Two contract problems from the last round, both introduced by the previous
commit rather than pre-existing.
Leaving the response schema typeless to admit legacy shapes cost more than it
bought: it trips Stainless `Schema/TypeMissing` and degrades the generated
TypeScript from `{ [key: string]: unknown }` to `unknown`, so an SDK consumer
that inspects metadata silently stops type-checking after a patch-level fix. The
schema now names the six JSON types explicitly, which still accepts the array
and scalar rows the column really holds while keeping a public type. Spectral
requires an `items` sibling once `array` is in the union, so that is there too.
The privacy paragraph also claimed metadata is "not sent anywhere else", which
is false and in the direction that matters: `publicWebhookData` returns
non-delete event data unchanged, so `feedback_record.created` and
`feedback_record.updated` carry metadata to whatever URL a tenant configured. It
now distinguishes the two — not sent to the LLM or embedding providers, but sent
in those webhooks.
BhagyaAmarasinghe
approved these changes
Sep 2, 2026
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What does this PR do?
Fixes ENG-2745 (https://linear.app/formbricks/issue/ENG-2745/hub-returns-500-instead-of-400-for-null-bytes-in-feedback-record)
metadatawas the only field on the feedback-record create/update requests with no content validation — and it couldn't have had it:no_null_bytesskips any non-string kind, andjson.RawMessageis a[]byte. So input the OpenAPI spec already declares invalid reached Postgres verbatim and failed the jsonb write as an unmapped 500.Postgres refuses three things in jsonb that pass every upstream check, and this PR maps all of them to a 400 naming
metadata:storable_jsonvalidator tag scans the raw bytes on both request structs. Raw bytes on purpose:encoding/jsonrewrites both cases on decode (NUL escape → real NUL, lone surrogate → U+FFFD), so an unmarshalled value looks storable while the wire bytes are not.{"n":1e1000000}— 15 bytes of valid JSON) — invisible to any byte scan, so SQLSTATE 22003 is mapped at the repository on both write paths. Attribution tometadatais sound: it's the only place a numeric can originate on these queries (value_numberis float8, and every float64 fits float8).Also rewrites the three
metadatadescriptions inopenapi.yaml(what belongs in it, snake_case keys, PATCH replaces wholesale, jsonb normalizes key order/number formatting — the old text said little beyond "additional context").Before / after for the same request:
How should this be tested?
Against a local stack (
docker run -d -e POSTGRES_PASSWORD=postgres -e POSTGRES_DB=test_db -p 5432:5432 pgvector/pgvector:pg18,.envwithDATABASE_URL=postgres://postgres:postgres@localhost:5432/test_db?sslmode=disableandAPI_KEY, thenmake init-db && make run-api):POST /v1/feedback-recordswith"metadata":{"note":"badvalue"}→ 400,invalid_paramsnamesmetadata(was 500,SQLSTATE 22P05in the log)"bad\ud83dvalue", a NUL in a key, and{"n":1e1000000}→ 400 each;PATCHbehaves identicallyvalue_textstill 400s as before, and ordinary metadata (nested objects, emoji, valid surrogate pairs, 200 keys, a 20k value) still stores and round-tripstests/feedback_record_metadata_validation_test.godrives all three rejection classes through the full HTTP stack against the real database::jsonbverdict on every one, in both directionsChecklist
Required
make buildmake tests(integration tests intests/)make fmtandmake lint; no new warningsgit pull origin mainmigrations/with goose annotations and ranmake migrate-validate(no schema change)Appreciated
make testsor API contract workflow)docs/if changes were necessary (openapi.yaml carries the doc change)make tests-coveragefor meaningful logic changesNote
AI model used —
claude-fable-5, reasoning effortunknown.