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DottaandClaude Fable 5.2
e8e548e856
## Thinking Path
> - Paperclip is the open source app people use to manage AI agents for
work
> - `packages/db` owns the schema and its migrations. There are 467
migrations, and several ship each day
> - A zero-downtime deploy starts the new release while the previous
release still serves the same database
> - Core does not say whether a migration is safe to apply under the
previous release. A deployer must treat each pending migration as a
reason to pause, or a person must review it
> - On stacks that may not pause, releases wait for hours
> - Core owns the schema, so Core must own this knowledge and publish it
as data
> - This pull request adds a conservative classifier, an in-file
override, the published result, and a guard for new migrations
> - The benefit is that a deployer can apply routine compatible
migrations automatically, and incompatible changes become visible at
review time
## Linked Issues or Issue Description
**Subsystem affected**
Database migrations (`packages/db`), the cloud migrator artifact
(`scripts/cloud-migrator-artifacts.mjs`), and the pull-request policy
job.
**Problem or motivation**
Core has no machine-readable statement that a migration can be applied
while the previous release still reads and writes the database. A
deployer cannot tell an added nullable column from a dropped column. It
must pause for both, or refuse the release.
**Proposed solution**
Classify each migration as `online_compatible`, `requires_staging`, or
`unknown`. Publish the result in the migrator manifest. Fail a pull
request when a migration it adds is `unknown` and has no reviewed
override in the file.
**Alternatives considered**
- A hand-kept list in the deployer. It goes stale and it is not reviewed
with the SQL.
- A sibling JSON file in the artifact. It needs a workflow change, and
the attestation of `manifest.json` would not cover it.
**Roadmap alignment**
This is release infrastructure. It adds no product feature.
## What Changed
- `packages/db/src/migration-compatibility.ts`:
`classifyMigrationSql(sql)` returns `{ compatibility, classified,
reasons, override, overrideError }`. It parses statement by statement
(breakpoints, `;`, comments, string and dollar quoting, guarded `DO`
blocks). A statement that it does not recognize is `unknown`. A
migration takes the worst class of its statements.
- Lock and duration hazards have their own reason codes
(`lock_hazard_*`) and classify as `unknown`, not as compatible with a
warning.
- Override: `-- paperclip:migration-compat online_compatible:
<justification>` (or `requires_staging`) in the leading comment block of
the migration file. The justification is mandatory (10 characters or
more). A malformed, repeated, or misplaced directive is an error and
never improves the verdict.
- A table counts as new after a plain `CREATE TABLE`, or after `CREATE
TABLE IF NOT EXISTS` when no earlier migration created that table.
`classifyMigrationSequence` classifies migrations in apply order with
that knowledge.
- `packages/db/scripts/migration-compatibility.ts` (run with `pnpm exec
tsx` in `packages/db`): classify files, print the distribution, print
JSON, or run the guard (`--check`). No new package script.
- Published data: `manifest.json` of the cloud migrator artifact has a
new additive field `migrationCompatibility`. `version` stays `1`. No
existing field changes. The build reads the SQL from the packed
`db.tgz`, so the data describes what the migrator applies. `validate`
(publisher) and `verify` reject data that is malformed or does not match
the packed migrations. The workflow file does not change.
- Guard for new migrations:
`.github/scripts/check-pr-migration-order.mjs` (the existing "Validate
migration ordering against target branch" policy step) now also
classifies the migrations that the pull request adds. `check:migrations`
runs the same guard against the merge base with `origin/master`, so the
`@paperclipai/db` typecheck and build report it locally. `unknown`
without an override fails. `requires_staging` prints a notice and
passes. A new migration that uses `CONCURRENTLY` also fails when it is
not in `MIGRATIONS_WITH_TOP_LEVEL_STATEMENTS`
(`packages/db/src/client.ts`), because the migrator would run it inside
a transaction.
- `doc/DATABASE.md`: new section "Migration compatibility with the
running release" under "Schema change workflow".
Published shape:
```json
"migrationCompatibility": {
"version": 1,
"migrations": [
{
"idx": 468,
"tag": "0468_busy_wendell_rand",
"sqlSha256": "56a6e272…",
"compatibility": "online_compatible",
"classified": "online_compatible",
"override": false,
"reasons": [
{ "code": "add_column", "compatibility": "online_compatible", "message": "Adds a column that is nullable or has a constant default.", "statements": [1] }
]
}
]
}
```
`sqlSha256` is the hash that the migrator records in the migration
history. `overrideJustification` is present only when `override` is
`true`. Entries are in apply order (journal `idx`, then file name; the
shipped journal repeats `idx` 178).
### Distribution over the existing migrations
No existing migration is rewritten or annotated.
| Class | All 467 | Newest 100 |
| --- | --- | --- |
| `online_compatible` | 228 (48.8%) | 67 |
| `requires_staging` | 114 (24.4%) | 12 |
| `unknown` | 125 (26.8%) | 21 |
Migrations per blocking reason (one migration can have several):
| Migrations | Class | Reason |
| --- | --- | --- |
| 74 | `requires_staging` | `create_unique_index_existing_table` |
| 70 | `unknown` | `lock_hazard_create_index` |
| 66 | `unknown` | `lock_hazard_validated_foreign_key` |
| 56 | `unknown` | `lock_hazard_data_backfill` |
| 54 | `unknown` | `drop_constraint` |
| 41 | `requires_staging` | `add_validated_check` |
| 33 | `unknown` | `drop_index` |
| 16 | `unknown` | `do_block_procedural` |
| 15 | `unknown` | `replace_function` |
| 13 | `unknown` | `create_trigger_existing_table` |
| 12 | `unknown` | `data_change_existing_table` |
| 10 | `unknown` | `drop_object`, `lock_hazard_set_not_null`,
`set_default` (each) |
| 8 | `requires_staging` | `drop_column` |
## Verification
- `pnpm --filter @paperclipai/db exec vitest run
src/migration-compatibility.test.ts`: 113 tests pass. They cover a
positive and a negative case for each rule, each reason code, the
override (missing, short, misplaced, and repeated justification are
rejected), unknown by default, the guard, the shipped migrations, the
`CONCURRENTLY` list, and the command line.
- `node --test scripts/cloud-migrator-artifacts.test.mjs
.github/scripts/tests/check-pr-migration-order.test.mjs`: 21 tests pass.
- Real bundle at the first commit of this branch: `preview-artifacts.mjs
pack`, then `cloud-migrator-artifacts.mjs build`, `validate`, and
`verify-install` pass. The manifest lists 467 migrations and is 312 KB.
This run found the repeated journal `idx`, which the second commit
handles.
- `pnpm --filter @paperclipai/db run check:migrations` passes. With
`--check --base HEAD~150` the guard fails on three `unknown` migrations
and prints notices for two `requires_staging` migrations.
- `pnpm verify` exits 2 because `.github/scripts/**` is a global CI
input. Required CI supplies the broad coverage.
- Not run: the publish job (it needs the master-only AWS role), and no
deployer reads the new field yet.
## Risks
- The manifest grows from about 1 KB to about 312 KB. A consumer that
rejects unknown manifest fields would fail. The verifier in this
repository ignores unknown fields; consumers outside this repository
were not inspected.
- From this merge, an open pull request that adds an `unknown` migration
fails the policy step and the `@paperclipai/db` typecheck until the
author rewrites the migration or adds the override. `drizzle-kit` emits
validated foreign keys and plain indexes for existing tables, so this is
common. The error text and `doc/DATABASE.md` give the fix.
- `ADD CONSTRAINT ... NOT VALID` classifies as `online_compatible`.
PostgreSQL still enforces it on new writes, so the author must make sure
that the previous release does not write rows that violate it.
- The classifier reads SQL only. It cannot see that new code writes
values that the previous release cannot read (for example a new enum
value). The `requires_staging` override exists for that case.
- `master` cannot fail the guard: the guard only judges migrations that
are not on the merge base.
## Model Used
- Claude (Anthropic), model ID `claude-fable-5-2`, in Claude Code with
tool use and code execution.
## Checklist
- [x] I have included a thinking path that traces from project context
to this change
- [x] I have specified the model used (with version and capability
details)
- [x] I have checked ROADMAP.md and confirmed this PR does not duplicate
planned core work
- [x] I have searched GitHub for duplicate or related PRs and linked
them above
- [x] I have either (a) linked existing issues with `Fixes: #` / `Closes
#` / `Refs #` OR (b) described the issue in-PR following the relevant
issue template
- [x] I have not referenced internal/instance-local Paperclip issues or
links (only public GitHub `#NNN` / `github.com/paperclipai/paperclip`
URLs)
- [x] My branch name describes the change (e.g. `docs/...`, `fix/...`)
and contains no internal Paperclip ticket id or instance-derived details
- [x] I have run tests locally and they pass
- [x] I have added or updated tests where applicable
- [x] I have updated relevant documentation to reflect my changes
- [x] I have considered and documented any risks above
- [x] All Paperclip CI gates are green
- [x] Greptile is 5/5 with no open P2s, recommendations, or follow-ups
- [x] I will address all Greptile and reviewer comments before
requesting merge
🤖 Generated with [Claude Code](https://claude.com/claude-code)
---------
Co-authored-by: Claude Fable 5.2 <noreply@anthropic.com>