TML-3453: db verify --strict passes on a database Prisma 7 built, because Prisma 7's ledger is left out by wmadden-electric · Pull Request #30671 · prisma/orm

wmadden-electric · 2026-10-09T10:07:23Z

At a glance

On a database Prisma 7 built, after Prisma 8 has taken over its migrations:

prisma db verify --strict --json
# before: exit 4, "unclaimed": ["_prisma_migrations"]
# after:  exit 0, "unclaimed": []

And prisma contract infer no longer prints a PrismaMigrations model for that table, so the hand edit the upgrade guide asks for is gone.

The decision

_prisma_migrations is the table Prisma 7 records its applied migrations in. It lives in the application's own schema (public by default), but it is the earlier tool's bookkeeping, not the application's data: Prisma 7's own db pull never introspects it. Prisma 8 keeps its own bookkeeping in the separate prisma_contract schema, which nothing reports.

The Postgres control adapter's introspect now leaves _prisma_migrations out of an application schema, unless a contract passed to it declares a table of that name in that namespace. The list is OTHER_TOOL_MIGRATION_TABLES in packages/3-targets/6-adapters/postgres/src/core/control-adapter.ts.

Every command that reads the live database goes through introspect, so all of them agree without a new hook: db verify (lenient and strict), db init, db update, the check the runner makes after applying a migration, db schema and contract infer. The framework and the SQL family are untouched and name neither Postgres nor Prisma 7. Marker and ledger reads query prisma_contract directly and are unaffected.

A contract that does declare a table named _prisma_migrations gets it introspected and verified like any declared table. The Mongo adapter already leaves out a collection of the same name; there it is Prisma 8's own ledger, so it is left out always.

Visible effects

db verify --strict passes on a database Prisma 7 built.
contract infer prints no model for the ledger.
db schema no longer shows it, as Prisma 7's db pull never did. The CLI README says so for both commands.
db update cannot plan to drop it, because it never sees it.
The rule matches the table name only, as Prisma 7's own db pull does. A user's own table named _prisma_migrations, in a schema the contract uses and not declared by it, is hidden too. The name is Prisma's own, so this is accepted.

How it is proven

packages/3-targets/6-adapters/postgres/test/control-adapter.tool-tables.test.ts: left out with no contract and with a contract that does not declare it; kept only in the namespace that declares it; kept when an unbound namespace and public resolve to the same schema. Red before the change.
test/integration/test/cli-journeys/prisma7-migration-ledger.e2e.test.ts, against a real database with Prisma 7's ledger columns: contract infer prints no model; strict verify exits 0 with nothing unclaimed; db update --dry-run plans nothing; db schema does not show it; a contract that declares the table has it verified normally.
examples/prisma7-adoption/test/handover.test.ts: strict verify now exits 0 with nothing unclaimed after every handover edit.

Alternatives considered

Declaring the ledger in the contract, under the observed or another control policy. Every Prisma 7 contract would hold a table with no model, so every Prisma 7 project's storage hash would change, and contract print would refuse every Prisma 7 contract at cutover, because Prisma 8 has no syntax yet for a table with no model.
Filtering only in db verify and contract infer. Each consumer would need the rule, and one that forgot it (db update, db schema) would disagree with the others.
A flag on db verify that lists tables to ignore. Rejected in earlier design notes: it makes every user discover and pass the flag for a table Prisma 8 already knows about.

Project: Storage a model does not map. Closes TML-3453. Follow-up for the public upgrade guide: TML-3540.

Agent: anansi-36

Summary by CodeRabbit

Bug Fixes
- PostgreSQL schema inspection, contract inference, and strict verification now omit Prisma’s _prisma_migrations table unless it is explicitly declared in the contract.
- When explicitly declared, the table is included in verification and checked like other declared tables. Dry-run updates no longer plan changes for an undeclared migration table.
Documentation
- Updated Prisma 7 guidance to clarify how _prisma_migrations is handled during schema inspection, contract inference, and strict verification.

Signed-off-by: willbot <w.a.madden+machine@gmail.com> Signed-off-by: Will Madden <madden@prisma.io>

The Postgres control adapter no longer introspects _prisma_migrations, the table Prisma 7 keeps its applied migrations in, unless the contract declares a table of that name in the same namespace. So db verify --strict reports nothing unclaimed on a database Prisma 7 built, contract infer prints no model for it, and db update plans nothing for it. The prisma7-adoption handover test now expects strict verify to exit 0. Signed-off-by: willbot <w.a.madden+machine@gmail.com> Signed-off-by: Will Madden <madden@prisma.io>

Signed-off-by: willbot <w.a.madden+machine@gmail.com> Signed-off-by: Will Madden <madden@prisma.io>

…ect docs and ADR 252 Signed-off-by: willbot <w.a.madden+machine@gmail.com> Signed-off-by: Will Madden <madden@prisma.io>

…d the unbound namespace Rename the list to OTHER_TOOL_MIGRATION_TABLES and state its rule once, on the constant. Add a unit case where the unbound namespace and public resolve to one schema, an e2e case that db schema leaves the table out, and a line in the CLI README for db schema and contract infer. Signed-off-by: willbot <w.a.madden+machine@gmail.com> Signed-off-by: Will Madden <madden@prisma.io>

coderabbitai · 2026-10-09T10:08:05Z

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docs/architecture docs/adrs/ADR 252 - An earlier Prisma version's schema is a contract source.md

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docs/architecture docs/adrs/ADR 252 - An earlier Prisma version's schema is a contract source.md

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📝 Walkthrough

Walkthrough

PostgreSQL introspection now omits _prisma_migrations unless the contract declares it in the resolved schema. Contract inference, schema output, verification, and migration-plan checks are updated and covered by adapter and CLI tests.

Changes

PostgreSQL migration-ledger handling

Layer / File(s)	Summary
Resolve declared tables during introspection `packages/3-targets/6-adapters/postgres/src/core/control-adapter.ts`, `packages/3-targets/6-adapters/postgres/test/control-adapter.tool-tables.test.ts`	The adapter resolves declared table names by schema and omits `_prisma_migrations` when the contract does not declare it there. Adapter tests cover undeclared tables and declarations in bound and unbound namespaces.
Validate migration-ledger CLI behavior `test/integration/test/cli-journeys/prisma7-migration-ledger.e2e.test.ts`, `examples/prisma7-adoption/test/handover.test.ts`	CLI journey tests cover inference, schema output, strict verification, dry-run updates, and verification of a declared ledger table. Handover tests expect strict verification to find no unclaimed objects after migration edits.
Update migration-ledger guidance `docs/architecture docs/adrs/ADR 252 - An earlier Prisma version's schema is a contract source.md`, `packages/1-framework/3-tooling/cli/README.md`, `examples/prisma7-adoption/README.md`, `upgrade-instructions/pending/prisma7-ledger-is-a-tool-table/app/instructions.md`	Architecture, CLI, and adoption documentation describe the exclusion. The pending upgrade instruction adds an empty `changes` list.

Priority: ➖ Normal

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

Change: Bug fix

Suggested reviewers: sevinf

Merge Risk

Merge Risk: 🔵 Low · up to 8f9d3

The change hides Prisma's migration ledger table from Postgres introspection unless the contract declares it. The remaining concerns are documentation wording and ADR conventions, with no known runtime risk, so the change is mergeable with minor doc follow-up.

Security Architecture Review

Security architecture risk: 🔵 Low · up to f826b

The main risk is a deliberate narrowing of strict verification: an undeclared table named _prisma_migrations is ignored. Explicit declarations retain normal checks, and the reviewed migration controls remain unchanged. No introduced security vulnerability was established.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

inferred — The direct visibility change is bounded to the exact-name ledger table in each schema already selected for introspection. It propagates to discovery, verification, and migration planning, without expanding the selected namespace set or database connection authority.

Trust Boundaries and Controls

observed — Database catalog table names feed an exact set-membership check. Schema selection remains parameterized in the table-discovery query, and explicit declaration restores ledger visibility only within the declaring resolved schema.

Resilience and Maintainability Implications

observed — The inspected migration path retains locking and transactional execution: apply operations, verify the resulting schema, update the marker, and write the Prisma 8 ledger before commit. Failure rolls back the transaction. These existing controls do not derive migration identity from the excluded Prisma 7 table.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 20.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 10 functions across 4 files. (1 skipped: …	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly identifies the main change: `db verify --strict` passes because Prisma 7's `_prisma_migrations` ledger is omitted. It is specific and related to the pull request.
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.

Full details: Docstring Coverage

Explanation

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pkg-pr-new · 2026-10-09T10:11:32Z

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commit: 18d166e

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Actionable comments posted: 2

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Inline comments:
Review comments at @docs/architecture docs/adrs/ADR 252 - An earlier Prisma
version's schema is a contract source.md:
- Line 81: Keep accepted ADR 252 append-only: restore its existing body and add
the migration-ledger rule as an appended decision or in a new ADR. Preserve the
rule that the earlier version’s `_prisma_migrations` table is excluded from
schema comparison and contract inference unless declared by the contract.

Review comments at @packages/1-framework/3-tooling/cli/README.md:
- Line 396: Qualify the Postgres omission statement in the `db schema`
documentation: say `_prisma_migrations` is omitted unless it is declared in the
resolved schema, in which case introspection retains it.

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docs/architecture docs/adrs/ADR 252 - An earlier Prisma version's schema is a contract source.md
examples/prisma7-adoption/README.md
examples/prisma7-adoption/test/handover.test.ts
packages/1-framework/3-tooling/cli/README.md
packages/3-targets/6-adapters/postgres/src/core/control-adapter.ts
packages/3-targets/6-adapters/postgres/test/control-adapter.tool-tables.test.ts
test/integration/test/cli-journeys/prisma7-migration-ledger.e2e.test.ts
upgrade-instructions/pending/prisma7-ledger-is-a-tool-table/app/instructions.md

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github-actions · 2026-10-09T10:14:48Z

size-limit report 📦

Path	Size
postgres / no-emit	239.76 KB (+0.05% 🔺)
postgres / emit	211.51 KB (+0.07% 🔺)
mongo / no-emit	199.35 KB (0%)
mongo / emit	177.2 KB (0%)
cf-worker / no-emit	299.38 KB (+0.06% 🔺)
cf-worker / emit	267.81 KB (+0.04% 🔺)

…dment Signed-off-by: willbot <w.a.madden+machine@gmail.com> Signed-off-by: Will Madden <madden@prisma.io>

…-prisma7-ledger-is-a-tool-table Signed-off-by: willbot <w.a.madden+machine@gmail.com> Signed-off-by: Will Madden <madden@prisma.io> # Conflicts: # projects/unmapped-storage/spec.md

wmadden-electric added 6 commits October 9, 2026 11:29

Specify slice 4: Prisma 7's ledger is a tool table

38ca7f9

Signed-off-by: willbot <w.a.madden+machine@gmail.com> Signed-off-by: Will Madden <madden@prisma.io>

Declare that leaving out Prisma 7's ledger needs no app upgrade

870bb60

Signed-off-by: willbot <w.a.madden+machine@gmail.com> Signed-off-by: Will Madden <madden@prisma.io>

Mark the Prisma 7 ledger gap resolved in the project spec

10009a9

Signed-off-by: willbot <w.a.madden+machine@gmail.com> Signed-off-by: Will Madden <madden@prisma.io>

Record where Prisma 7's ledger is left out, in the slice 4 spec, proj…

785b5e1

…ect docs and ADR 252 Signed-off-by: willbot <w.a.madden+machine@gmail.com> Signed-off-by: Will Madden <madden@prisma.io>

wmadden-electric requested a review from a team as a code owner October 9, 2026 10:07

coderabbitai Bot reviewed Oct 9, 2026

View reviewed changes

Comment thread .../architecture docs/adrs/ADR 252 - An earlier Prisma version's schema is a contract source.md Outdated

Comment thread packages/1-framework/3-tooling/cli/README.md

Keep ADR 252 append-only: record the migration ledger rule as an amen…

8f9d388

…dment Signed-off-by: willbot <w.a.madden+machine@gmail.com> Signed-off-by: Will Madden <madden@prisma.io>

wmadden-electric mentioned this pull request Oct 9, 2026

TML-3467: The Prisma 7 reader keeps the columns and tables @ignore hides #30672

Merged

Merge branch 'main' of https://github.com/prisma/prisma into tml-3453…

18d166e

…-prisma7-ledger-is-a-tool-table Signed-off-by: willbot <w.a.madden+machine@gmail.com> Signed-off-by: Will Madden <madden@prisma.io> # Conflicts: # projects/unmapped-storage/spec.md

wmadden approved these changes Oct 9, 2026

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wmadden-electric added this pull request to the merge queue Oct 9, 2026

github-merge-queue Bot removed this pull request from the merge queue due to a conflict with the base branch Oct 9, 2026

wmadden-electric added this pull request to the merge queue Oct 9, 2026

Merged via the queue into main with commit c8dc80b Oct 9, 2026
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wmadden-electric deleted the tml-3453-prisma7-ledger-is-a-tool-table branch October 9, 2026 16:05

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TML-3453: db verify --strict passes on a database Prisma 7 built, because Prisma 7's ledger is left out - #30671

TML-3453: db verify --strict passes on a database Prisma 7 built, because Prisma 7's ledger is left out#30671
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At a glance

The decision

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Alternatives considered

Summary by CodeRabbit

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