fix(supabase): never answer a cached row past the adapter's own writes

[jddunn]

Summary

• With enableCache() on, SupabaseAdapter's get and all kept each answer by statement and parameters, and no write cleared them: a row read, then updated through run, exec, transaction or batchWrite, came back from the cache as it stood before the update. A store that reads a row, marks it and reads it again (an unsubscribe token found after it was revoked) got the old row.
• get and all also kept the answer of a statement that writes: get('INSERT ... RETURNING id', params) ran once and the second call answered the first row without inserting, all('UPDATE ... RETURNING ...') ran once, and so did get('SELECT bump(?)', params), whose function writes. A string of statements with a COMMIT in it, such as all('SELECT 1; COMMIT; UPDATE t ...'), ended the cache's transaction, and the UPDATE after it committed in one of its own.
• A read in flight across a write stored the row it read after the write ended.
• A hit answered the kept row or list itself, and the first caller got it too, so a caller that changed what it was given changed what the cache answered next.
• get and all of one statement shared a key, so one answered the other's row or list, and the key wrote parameters as JSON: a bigint parameter threw before the statement ran, a statement bound to NaN or an infinity answered the row kept for null, one bound to a Date (from this realm or another) answered the row kept for its ISO text, which pg binds as other text, bytes and an object JSON writes alike (Buffer.from([1]) and { type: 'Buffer', data: [1] }) answered each other's row, two objects pg binds through their own toPostgres shared a key whenever JSON wrote them alike, as it writes two whose state is private, and text spelling a Date's key (U+0000, then the Date's tag and time), which PostgreSQL refuses, answered the row kept for that Date.

The cache now holds the answers of SELECTs alone (a statement whose first word, past white space and comments, nesting as PostgreSQL nests them, is SELECT), and of those only the ones that wrote nothing: a SELECT the cache does not hold runs once in a transaction of its own, and its answer is kept only when pg_current_xact_id_if_assigned() is NULL in that transaction, as PostgreSQL gives a transaction an ID when it first writes (https://www.postgresql.org/docs/current/transaction-id.html), and the answer is one result, not a list of them. So a SELECT that calls a function that writes, or makes a table with INTO, runs each time and clears the cache; a SELECT that names into only in a literal, a quoted name or a comment is cached. Any other statement through run, exec, get or all, and every transaction (so batchWrite and migrate), clears the cache when it ends, and clearCache() moves a generation that a read checks before it keeps its answer, so a read that a write overtook keeps nothing. A key names its call and writes each parameter as pg binds it (prepareValue in pg 8.23.1): text, numbers, bigints and booleans as the text pg sends, bytes by their hex, a Date of any realm by its time, and arrays and JSON objects tagged; a read bound to an object with its own toPostgres, or to text holding U+0000, runs each time. The cache keeps a copy and answers a copy, with a Date and a Buffer copied as themselves, and keeps no answer holding a value it has no faithful copy of, such as the interval pg parses to an object of its own. enableCache()'s doc says what the cache cannot see (a write through another adapter, pool or process, an effect that writes no row, such as pg_notify() or an advisory lock, and a SELECT whose answer changes by itself, such as random(), now() or nextval(), with run or a first word other than SELECT as the way round it) and that the check needs PostgreSQL 13 or later; every supported PostgreSQL version has it (https://www.postgresql.org/support/versioning/).

Red first: the first commit holds the tests alone, and CI's build job failed on exactly the three cases of the first round (job 117434335292); each later round came as tests alone too and failed on exactly its cases before its fix (six in job 117518478414; seven in job 117524826077). The release is 0.7.16, whose notes also name S3StorageProvider.list's paging (#64), merged without a version.

Checklist

• Tests added/updated
• Docs updated (README or typedoc)
• Conventional commit title/body

Related

None.

Summary by Sourcery

Make SupabaseAdapter caching safe by caching only verified read-only SELECT results and invalidating cached data around all writes.

Bug Fixes:

• Prevent SupabaseAdapter query caching from returning stale results after the adapter’s own writes or for statements that perform writes.
• Ensure cached reads use safe, call-specific parameter keys and return isolated copies without caching values that cannot be faithfully copied.
• Handle PostgreSQL transaction effects and in-flight reads so cache entries are invalidated whenever writes may have occurred.

Enhancements:

• Restrict caching to read-only SELECT statements and document cache limitations, PostgreSQL version requirements, and invalidation behavior.
• Add comprehensive Supabase cache coverage for writes, transactions, parameter serialization, mutation isolation, implicit writes, and concurrent reads.

Documentation:

• Document the revised SupabaseAdapter cache semantics and limitations in the changelog and API documentation.

Tests:

• Add integration tests covering cache invalidation, read/write statements, parameter keying, defensive copies, unsupported values, and concurrent operations.

Chores:

• Release version 0.7.16 and record the S3 storage listing pagination fix in the changelog.

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📥 Commits

Reviewing files that changed from the base of the PR and between 1c4af4d and 1a7d59c.

📒 Files selected for processing: 3

• CHANGELOG.md
• src/adapters/supabase.ts
• tests/supabaseAdapter.spec.ts

📝 Walkthrough

The Supabase adapter now caches only eligible plain reads and clears cached results after writes and transactions. Tests cover query classification, cache behavior, and reads overlapping writes. The package version and changelog were updated.

Changes: Supabase cache behavior

Layer / File(s)	Summary
Plain-read caching src/adapters/supabase.ts, tests/supabaseAdapter.spec.ts	The adapter caches get and all results only for string statements classified as plain SELECT reads without INTO. Tests cover classification, cache keys, and result behavior.
Write invalidation and release updates src/adapters/supabase.ts, tests/supabaseAdapter.spec.ts, CHANGELOG.md, package.json	run, exec, non-read statements, and transactions clear the cache, including when execution fails. Cache generations prevent in-flight reads from storing results after a clear. Tests cover writes and overlapping reads. The package version is now 0.7.16; the changelog records the cache changes and S3 pagination behavior.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix

Merge Risk: 🟠 High · up to 1c4af

With the query cache enabled, all() can return a single row instead of a list. Reads with BigInt parameters fail outright, and some reads are wrongly treated as writes and clear the cache. A SELECT that calls a writing function is also cached, so repeated calls return stale results. The Supabase adapter tests fail on this revision, so the 0.7.16 release is not ready to merge until these cache issues are fixed.

Pre-merge checks: 5

Check name	Status	Explanation
Docstring Coverage		No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
Title check		The title clearly identifies the primary change: preventing SupabaseAdapter from returning cached rows after adapter-owned writes. It is concise and specific.
Description check		The description includes the required Summary, Checklist, and Related sections. It explains the problem, implementation, tests, documentation, release changes, and issue status in sufficient detail.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2 files. (2 skipped: 2 unsupported.)

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Reviewer's Guide

Adds SupabaseAdapter cache-on integration tests documenting the required invalidation behavior: only plain SELECT reads may be cached, all adapter-owned writes invalidate prior results, write-like statements are executed every time, and reads overtaken by writes cannot repopulate stale cache data.

File-Level Changes

Change	Details	Files
Add integration coverage proving SupabaseAdapter cache entries stay consistent with adapter-owned writes and that write statements are never cached.	Enable and disable the adapter cache around focused scenarios. Verify cached get/all results reflect writes through run, exec, transaction, and batchWrite. Verify INSERT/UPDATE/DELETE and SELECT INTO statements execute on every request, including statements preceded by nested comments. Verify in-flight reads completing after a write are not retained as stale cache entries.	tests/supabaseAdapter.spec.ts

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Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-17T15:47:00.378417Z	17d64ca	Draft marked ready

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[qodo-free-for-open-source-projects]

PR Summary by Qodo

Prevent stale Supabase cache reads after adapter-owned writes

🐞 Bug fix 🧪 Tests 📝 Documentation ⚙️ Configuration changes 🕐 20-40 Minutes

AI Description

• Cache only plain Supabase reads and invalidate cached answers after adapter-owned writes.
• Prevent in-flight reads from repopulating a cache cleared during their execution.
• Add PostgreSQL integration coverage, document cache limits, and bump the package version.

Diagram

graph TD
  C["Adapter calls"] --> D{"Plain read?"} -->|yes| K["Query cache"] -->|miss| P["Postgres pool"]
  D -->|no| W["Write paths"] --> P
  W -->|completion| G["Cache generation"] -->|invalidate| K
  P -->|read completes| G
  G -->|unchanged: store| K
  K -->|hit| C

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High-Level Assessment

The following are alternative approaches to this PR:

1. Disable the Supabase query cache

• ➕ Avoids stale cache answers without SQL classification or generation tracking.
• ➖ Removes the performance benefit for repeated reads.

2. Use a PostgreSQL SQL parser for cache eligibility

• ➕ Could classify more statement forms precisely.
• ➖ Adds dependency and maintenance cost to a deprecated adapter; parsing alone cannot establish whether every SELECT is side-effect-free.

Recommendation: Keep the PR's conservative classification and generation-based invalidation: it preserves useful caching without a new dependency and addresses writes through this adapter. Retain the documented limitation that external writes and changing SELECT results remain invisible to the cache.

Files changed (4) +184 / -62

Bug fix (1) +101 / -59

supabase.tsRestrict caching to plain reads and invalidate after writes +101/-59

Restrict caching to plain reads and invalidate after writes

• Classifies cacheable SELECT statements after leading whitespace and nested comments, excluding statements that name INTO. Clears cached results after non-read queries, scripts, and transactions, and uses a generation counter to stop overtaken reads from restoring invalidated entries. Documents the behavior and its limits on enableCache().

src/adapters/supabase.ts

Tests (1) +76 / -2

supabaseAdapter.spec.tsCover cache consistency against PostgreSQL +76/-2

Cover cache consistency against PostgreSQL

• Adds conditional integration tests for cache hits, invalidation across write paths, repeated write-returning queries, nested comments, SELECT INTO, and a read overlapping a write. These tests run when POSTGRES_TEST_URL is set.

tests/supabaseAdapter.spec.ts

Documentation (1) +6 / -0

CHANGELOG.mdDocument the 0.7.16 fixes +6/-0

Document the 0.7.16 fixes

• Adds release notes for Supabase cache consistency and its remaining limitations. Also records an S3 listing pagination fix, although no S3 implementation change appears in this diff.

CHANGELOG.md

Other (1) +1 / -1

package.jsonBump the package version to 0.7.16 +1/-1

Bump the package version to 0.7.16

• Advances the published package version from 0.7.15 to 0.7.16.

package.json

[qodo-free-for-open-source-projects]

Code Review by Qodo

🐞 Bugs (0) 📘 Rule violations (0) 📎 Requirement gaps (0) 🎨 UX issues (0) 🔗 Cross-repo conflicts (0) 📜 Skill insights (0)

1. A read containing “into” clears the cache ✓ Resolved

Description

isPlainRead searches the entire SQL string for into, including inside string literals and
comments, rather than checking whether it is a SELECT INTO clause. With caching enabled, a plain
read such as SELECT 'into' AS word is therefore not cached and clears every other cached answer
when it finishes.

Code

src/adapters/supabase.ts[89]

+      return /^select\b/i.test(statement.slice(at, at + 7)) && !/\binto\b/i.test(statement);

Evidence

The new text-wide regex matches into in SELECT 'into' AS word. That makes read false, so the
new finally branches clear the cache after executing an otherwise plain read.

src/adapters/supabase.ts[64-92]
src/adapters/supabase.ts[254-274]
src/adapters/supabase.ts[279-299]

Agent prompt

The issue below was found during a code review. Follow the provided context and guidance below and implement a solution

## Issue description
A plain SELECT containing `into` in a literal or comment is treated as a write. It bypasses caching and clears unrelated cached reads.
## Fix Focus Areas
- src/adapters/supabase.ts[64-92]
- src/adapters/supabase.ts[273-299]
## Recommended Fix
When checking for SELECT INTO, skip SQL comments and quoted literals or identifiers so only an INTO token in the SQL structure makes the statement non-cacheable. Add coverage showing that a plain read containing a quoted `into` retains its own and other cached answers.

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Codecov Report

❌ Patch coverage is 89.89899% with 20 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/adapters/supabase.ts	89.89%	20 Missing ⚠️

📢 Thoughts on this report? Let us know!

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Reviewed commit: 17d64ca4c9

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Actionable comments posted: 4

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• 🪄 Fix comments: Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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Inline comments:
Review comments at @src/adapters/supabase.ts:
- Line 89: Update isPlainRead to detect the INTO keyword only outside string
literals, quoted identifiers, dollar-quoted strings, and comments. Add a helper
that handles escaped and unterminated constructs, treating unterminated literals
or quotes as containing INTO so the statement is not cached.
- Around line 222-225: Update getCacheKey, which is called by cacheKeyOf, to
serialize BigInt and non-finite numbers using distinct type-tagged
representations so BigInt does not throw and NaN or infinities cannot collide
with null or each other. Preserve the existing query-and-parameters cache key
structure.
- Line 258: Update the cache-key generation in the get and all methods to
include the method name, and adjust cacheKeyOf to incorporate that discriminator
so cached row objects and arrays cannot share a key.

Review comments at @tests/supabaseAdapter.spec.ts:
- Around line 147-153: Update the `bump` assertions in this test to match the
documented cache contract: treat `SELECT ${bump}(?) AS label` as a cached read,
and call `db.clearCache()` before asserting results that should reflect a later
function call. Do not change the cache design or documentation.

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• CHANGELOG.md
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• tests/supabaseAdapter.spec.ts

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