TML-3475: --rename Profile:User makes migration plan and db update rename a model or field instead of dropping it by wmadden-electric · Pull Request #30638 · prisma/orm

wmadden-electric · 2026-10-07T13:28:13Z

At a glance

A user renames the Profile model to User, and its name field to fullName, in the contract source. Today migration plan reads that as "drop table Profile, create table User", and the rows are gone once the user consents to the drop. With this PR the user says what they did:

$ prisma migration plan --name tidy --rename Profile:User --rename User.name:User.fullName
✔ Planned 6 operation(s)

migrations/app/20261007T1003_tidy
├─ Rename table "Profile" to "User"
├─ Rename primary key "Profile_pkey" to "User_pkey" on "User"
├─ Rename index "Profile_handle_idx_b5b249e4" to "User_handle_idx_b5b249e4" on "User"
├─ Rename column "User"."name" to "fullName"
├─ Rename unique constraint "Profile_name_key" to "User_fullName_key" on "User"
└─ Rename index "Profile_name_handle_idx_f7a67607" to "User_fullName_handle_idx_46490beb" on "User"

Statements applied
├─ rename model "Profile" to "User" (3 operations)
└─ rename field "User.name" to "User.fullName" (3 operations)

The written migration.ts calls renameTable and renameColumn, as a user would write by hand. prisma db update takes the same flags and makes the same change to a live database.

The decision

A rename is stated by the user on the command line as --rename <old>:<new>, in the names the contract source uses (Model or Model.field). The planner never guesses: a change without a statement is planned exactly as the diff shows it.

We call --rename Profile:User a statement: the user stating what they meant by an edit the planner cannot tell apart from something else. A dropped table plus a new table may be a rename or may be two unrelated changes; only the user knows. Later PRs add more statements (--delete, and conversions and backfills) on the same mechanism.

How it works

1. Parsing and resolving. The CLI parses each --rename and looks both names up: the old name in the origin contract (the contract the database is at now) and the new name in the destination contract (the one being planned to). The result says which namespace, model and field each side is, in contract terms, not table or column names. This happens in the framework, so it works the same for every database family.

2. Turning it into a storage change. The SQL family maps each resolved rename to what changes in the database: a table rename, a column rename, or nothing when the storage name did not change (for example, a model renamed while @@map keeps its table name). It applies these in order to an in-memory copy of the current database schema.

3. Planning. The Postgres and SQLite planners emit the rename, rename every primary key, constraint and index named after the old table or column to the name the destination contract gives it, and then run the usual diff against the renamed copy. Whatever else changed is planned as before.

4. Reporting. The plan result lists each statement with the positions of the operations it produced. Both commands print this as Statements applied, and include it in --json.

5. db update. db update has no migration history to read the old contract from, so it looks up the snapshot of the contract whose hash the database marker records. It does this only when statements are given. Running the same statement twice fails the second time and says the rename already happened.

6. Errors. A statement that cannot be used stops the command before anything is written:

MIGRATION.STATEMENT_INVALID: the text is not old:new.
MIGRATION.STATEMENT_UNRESOLVED: a name does not exist in the contract it was looked up in.
MIGRATION.STATEMENT_ORIGIN_UNKNOWN: there is no origin contract to look the old name up in.

Each says what was searched, what was found, and what to type instead. A statement the planner understands but cannot carry out (a model moved to another namespace, or any statement on MongoDB) fails planning with a statementRefused conflict that names the statement.

7. Drops that lose no data stop asking for consent. A SQLite rename rebuilds the table, which drops and recreates its indexes. Those drops were classed as destructive, so every SQLite rename would have asked for consent to lose data that was never at risk. On Postgres and SQLite, dropping an index, a unique, foreign-key or check constraint, a row-level-security policy, a default or a native enum type, and disabling row-level security, are now classed as widening: they change structure, and no rows or values are lost.

8. MongoDB refuses statements for now. Without this it would have accepted --rename and planned a drop and create. The refusal says how to keep the documents by hand.

Where to look

packages/1-framework/3-tooling/cli/src/control-api/statements/: parsing and resolution. The control API takes one ordered list of { verb, text }, so later statements use the same entry point.
packages/1-framework/1-core/framework-components/src/control/migration-statements.ts: the resolved and applied statement types. Planner options gain statements and origin; the result gains appliedStatements.
packages/2-sql/9-family/src/core/migrations/statement-planning.ts: step 2.
packages/3-targets/3-targets/{postgres,sqlite}/src/core/migrations/: the in-memory schema copy, the new renameColumn operation, and the companion renames.
packages/1-framework/3-tooling/migration/src/aggregate/: only the application's own migration space receives statements; extension spaces do not.
The Postgres and SQLite qualifyTable helpers now escape " in identifiers. Review found that a table name containing a quote reached the rename SQL unescaped.

Verification

Journeys on Postgres and SQLite (test/integration/test/cli-journeys/rename-statements-migration*.e2e.test.ts) rename a model and a field through migration plan + db migrate and through db update, on tables with rows, a unique, a foreign key from another table, a secondary index, and on Postgres a check and a policy. They assert the rows survive, a further plan is empty, db verify --schema-only is clean, re-running migration.ts writes identical output, and a repeated db update fails.
A manual QA run against real Postgres, SQLite and MongoDB; its findings are fixed.
Upgrade instructions: upgrade-instructions/pending/migration-statement-renames/.

Not in this PR

Refusing data loss until the user says --delete or --rename: the next PR, TML-3476: migration plan and db update refuse to lose data until each drop is answered with --delete or --rename #30648.
--convert, --backfill, and renames of namespaces, enum values and value-object fields.
A model that keeps its name but changes @@map: refused, with the manual steps.
Statements on MongoDB.

Alternatives considered

Intent in the contract source (@@hint(was: ...), Shape the intent-hints project: the planner refuses destructive changes unless the schema states the intent #30557, TML-3422: a model rename stated with @@hint(was:) plans as a rename, and only data loss counts as destructive #30570): shelved. It was unintuitive, and the hint had to stay in the source until every environment had applied it.
Detecting renames, or a yes/no prompt asking whether a drop is a rename: detection guesses, and a yes/no prompt cannot be answered by a script or an agent.
Storage names on the command line (--rename-table): the command line speaks the contract's names, so a statement means the same thing on every database family.
Pointing statements at operations by id (adding the schema to Postgres operation ids): re-emitting an existing migration with new ids would change its hash and lose its applied mark in the ledger. Statements point at operations by position instead.

Refs: TML-3475

Agent: turing-38

Summary by CodeRabbit

New Features
- Added repeatable --rename old:new options to migration plan and db update for model and field renames. PostgreSQL and SQLite plans can include corresponding table, column, and related-object renames.
- Plans and update results now report applied rename statements and their associated operations.
- Added validation and actionable errors for invalid, unresolved, or unsupported rename statements. MongoDB plans report rename statements they cannot apply.
Behavior Changes
- Drops of non-data-bearing objects and disabling row-level security are classified as widening operations on SQL targets.

coderabbitai · 2026-10-07T13:28:53Z

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packages/1-framework/1-core/errors/test/control.test.ts
packages/1-framework/1-core/errors/test/migration.test.ts
packages/1-framework/3-tooling/cli/src/control-api/operations/migration-plan.ts
packages/1-framework/3-tooling/cli/src/control-api/operations/ref-resolution.ts
packages/1-framework/3-tooling/cli/src/orm/db/update.ts
packages/1-framework/3-tooling/cli/test/control-api/statements/resolve-field-statements.test.ts
packages/1-framework/3-tooling/cli/test/orm/db-update-to-resolution.test.ts
packages/1-framework/3-tooling/cli/test/orm/migration-plan-statements.test.ts

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packages/1-framework/3-tooling/cli/test/orm/migration-plan-statements.test.ts
packages/1-framework/3-tooling/cli/src/control-api/operations/migration-plan.ts

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📝 Walkthrough

Walkthrough

The pull request adds repeatable --rename statements to migration planning and database updates. It resolves model and field names against contracts, plans renames on PostgreSQL and SQLite, reports applied statements, and refuses unsupported MongoDB renames. It also reclassifies several non-data-bearing operations as widening.

Changes

Migration rename statements

Layer / File(s)	Summary
Statement parsing and resolution `packages/1-framework/3-tooling/cli/src/control-api/statements/`, `packages/1-framework/1-core/framework-components/src/control/`	The CLI parses ordered model and field rename statements, resolves their names against origin and destination contracts, and reports invalid or unresolved statements.
CLI planning and updates `packages/1-framework/3-tooling/cli/src/control-api/operations/`, `packages/1-framework/3-tooling/cli/src/orm/`	`migration plan` and `db update` accept repeatable `--rename` options. Update statements use the marker-hash snapshot as their origin when present. Results include applied-statement reports and operation indexes.
Shared and SQL planner flow `packages/1-framework/3-tooling/migration/src/aggregate/`, `packages/2-sql/9-family/src/core/migrations/`	Planner inputs now distinguish `origin` from `fromContract`. Aggregate planning forwards app-space statements, and SQL planning validates and orders rename calls.
PostgreSQL and MongoDB behavior `packages/3-targets/3-targets/postgres/src/core/migrations/`, `packages/3-mongo-target/1-mongo-target/src/core/migrations/`	PostgreSQL plans table and column renames with related object operations. MongoDB refuses supplied rename statements with a planning conflict.
SQLite behavior `packages/3-targets/3-targets/sqlite/src/core/migrations/*`	SQLite plans table and column renames against an evolving schema, including related index replacements and destination-name checks.
Operation policy and compatibility updates `packages/3-targets/3-targets/postgres/src/core/migrations/`, `packages/3-targets/3-targets/sqlite/src/core/migrations/`, `docs/architecture/*`, `docs/reference/error-reference.md`	Several SQL drops and RLS changes are classified as widening. Planner inputs, documentation, and tests are updated for the new contracts and classifications.

Priority: ➖ Normal

Estimated code review effort: 5 (Critical) | ~120 minutes

Sequence Diagram(s)

sequenceDiagram
  participant CLI as migration plan or db update
  participant Resolver as resolveStatements
  participant Planner as SQL migration planner
  participant Target as PostgreSQL or SQLite target
  participant Reporter as applied-statement reporting
  CLI->>Resolver: Resolve rename text against origin and destination contracts
  Resolver->>Planner: Pass resolved statements
  Planner->>Target: Plan rename and companion operations
  Target-->>Planner: Return planned operations and applied statement indexes
  Planner-->>Reporter: Provide applied statements and operation positions
  Reporter-->>CLI: Return statement descriptions and indexes

Merge Risk: 🔵 Low · up to 02850

PostgreSQL updates can remove row-level access controls without a destructive-change prompt. This is a documented widening-operation behavior, but owners should be aware of its access implications when applying such plans. The rename-order and retry-command concerns are resolved.

Security Architecture Review

Security architecture risk: 🟡 Moderate · up to 02850

Explicit renames preserve data and remain constrained to managed database objects. However, this PR also removes confirmation for disabling PostgreSQL row-level security when no data-destructive operation accompanies it. An unintended configuration change could consequently expose protected rows to database users with existing table privileges. Transactional execution limits partial updates, but does not prevent a committed access-control relaxation.

Retained concerns

Medium · security · observed: Reclassifying PostgreSQL RLS disabling and policy removal as widening removes their existing db update confirmation checkpoint when no destructive operation accompanies them. Disabling RLS can remove row or tenant isolation for roles with table privileges; policy-removal effects depend on the remaining policies. This is a security-relevant safeguard reduction within an already-privileged workflow, not a demonstrated unauthenticated bypass.

Security review details

Security Blast Radius

inferred — RLS disabling targets named tables, not a database-wide privilege grant. Its potential exposure covers protected rows on every affected table in the applied plan, for roles already holding relevant table privileges. This can cross tenant boundaries where RLS supplies isolation. Actual grants, policies, and tenant placement were not supplied.

Security Findings and Attack Paths

inferred — An actor or accidental edit that changes the authoritative contract's RLS enablement can cause a privileged db update to disable RLS without the prior confirmation checkpoint. Subsequent access by roles with table privileges may then reach previously filtered rows. This path requires contract influence and execution by a database principal authorized to alter the table; rename text alone does not confer that authority.

Trust Boundaries and Controls

observed — Raw rename input is resolved to contract coordinates before storage planning. The SQL-family planner refuses unmanaged destination tables, and PostgreSQL and SQLite rename operations quote identifiers. These controls constrain object selection and SQL construction, but do not restore confirmation for widening RLS operations.

Resilience and Maintainability Implications

inferred — Transactional rollback and schema verification contain partial migration failures. They do not reject a destination contract that intentionally disables RLS: a successful, consistent commit can still weaken access control. The security decision therefore cannot be delegated solely to migration consistency checks.

Hardening Proposals

proposed — Consider representing access-control weakening separately from data-loss classification, allowing interactive and automated workflows to require explicit authorization for RLS relaxation without treating data-preserving renames as destructive.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

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Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: adding --rename support to migration plan and db update so model or field renames avoid drop-and-add behavior.

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github-actions · 2026-10-07T13:35:31Z

size-limit report 📦

Path	Size
postgres / no-emit	227.78 KB (-0.01% 🔽)
postgres / emit	204.42 KB (-0.03% 🔽)
mongo / no-emit	199.13 KB (+0.02% 🔺)
mongo / emit	177.16 KB (+0.01% 🔺)
cf-worker / no-emit	285.72 KB (+0.02% 🔺)
cf-worker / emit	259.63 KB (+0.01% 🔺)

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Actionable comments posted: 5

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Inline comments:
Review comments at
@packages/1-framework/1-core/framework-components/src/control/control-migration-types.ts:
- Around line 71-80: Add an access-control confirmation check to the `db update`
apply path for operations that drop an RLS policy or disable row-level security,
including non-interactive runs. Keep these operations classified as `widening`;
do not change the general `widening` classification or require confirmation for
unrelated widening operations.

Review comments at
@packages/1-framework/3-tooling/cli/src/control-api/operations/migration-plan.ts:
- Around line 722-742: When auto-baseline skips the delta because fromHash
equals toStorageHash, the baseline-only results omit resolved statements from
appliedStatements. In the deltaLeg undefined branches, use
reportAppliedStatements to report each statement with empty operationIndexes,
consistent with the regular no-operations path.

Review comments at @packages/1-framework/3-tooling/cli/src/orm/db/update.ts:
- Line 227: Update retryCommandFor to accept and include each repeated rename
flag in its generated retry command, then pass args.flags.rename from the db
update call to retryCommandFor so retries preserve the rename statements
supplied to client.dbUpdate.

Review comments at
@packages/2-sql/9-family/src/core/migrations/statement-planning.ts:
- Around line 466-488: Update #planField to receive the remaining statements
from planStatements, and check whether any later statement renames the same
origin model. When one does, refuse with a message directing the user to put the
model rename before the field rename; otherwise preserve the existing refusal
behavior.

Review comments at
@packages/3-targets/3-targets/postgres/src/core/migrations/op-factory-call.ts:
- Line 2050: Update DisableRowLevelSecurityCall and the disableRowLevelSecurity
operation metadata to classify RLS disablement as destructive, ensuring it
requires explicit confirmation; leave policy-drop operations classified as
widening.

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⛔ Files ignored due to path filters (14)

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projects/migration-statements/manual-qa-reports/2026-10-07-qa-opus.md is excluded by !projects/**
projects/migration-statements/manual-qa.md is excluded by !projects/**
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projects/migration-statements/slices/renames/dispatches/02-statement-grammar-resolver.md is excluded by !projects/**
projects/migration-statements/slices/renames/dispatches/03-model-renames-on-sql-planners.md is excluded by !projects/**
projects/migration-statements/slices/renames/dispatches/04-column-rename-and-field-statements.md is excluded by !projects/**
projects/migration-statements/slices/renames/dispatches/05-flag-origin-contract-output.md is excluded by !projects/**
projects/migration-statements/slices/renames/dispatches/06-journeys-upgrade-fragment-docs.md is excluded by !projects/**
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📒 Files selected for processing (296)

docs/architecture docs/adrs/ADR 001 - Migrations as Edges.md
docs/architecture docs/adrs/ADR 028 - Migration Structure & Operations.md
docs/architecture docs/adrs/ADR 243 - Name-identified indexes and exact-name adoption.md
docs/architecture docs/adrs/ADR 244 - Check constraints are opaque wire-named expressions.md
docs/architecture docs/adrs/ADR 264 - A model names its storage verbatim, and a rename is an operation.md
docs/architecture docs/subsystems/1. Data Contract.md
docs/architecture docs/subsystems/5. Adapters & Targets.md
docs/architecture docs/subsystems/7. Migration System.md
docs/architecture docs/subsystems/9. No-Emit Workflow.md
docs/reference/error-reference.md
examples/prisma7-adoption/test/handover.test.ts
packages/1-framework/1-core/errors/src/control.ts
packages/1-framework/1-core/errors/src/exports/migration.ts
packages/1-framework/1-core/errors/src/migration.ts
packages/1-framework/1-core/errors/test/control.test.ts
packages/1-framework/1-core/framework-components/src/control/contract-snapshot-layout.ts
packages/1-framework/1-core/framework-components/src/control/control-migration-types.ts
packages/1-framework/1-core/framework-components/src/control/migration-statements.ts
packages/1-framework/1-core/framework-components/src/exports/control.ts
packages/1-framework/1-core/framework-components/test/contract-snapshot-layout.test.ts
packages/1-framework/1-core/framework-components/test/control-migration-types.test.ts
packages/1-framework/1-core/framework-components/test/migration-statements.test.ts
packages/1-framework/3-tooling/cli/README.md
packages/1-framework/3-tooling/cli/src/control-api/client.ts
packages/1-framework/3-tooling/cli/src/control-api/operations/db-run.ts
packages/1-framework/3-tooling/cli/src/control-api/operations/db-update.ts
packages/1-framework/3-tooling/cli/src/control-api/operations/migrate.ts
packages/1-framework/3-tooling/cli/src/control-api/operations/migration-plan.ts
packages/1-framework/3-tooling/cli/src/control-api/statements/parse-rename.ts
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packages/1-framework/3-tooling/cli/src/orm/db/migration-blocks.ts
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packages/1-framework/3-tooling/cli/test/control-api/db-update-statements.test.ts
packages/1-framework/3-tooling/cli/test/control-api/db-update.test.ts
packages/1-framework/3-tooling/cli/test/control-api/progress.test.ts
packages/1-framework/3-tooling/cli/test/control-api/statements/parse-rename.test.ts
packages/1-framework/3-tooling/cli/test/control-api/statements/resolve-field-statements.test.ts
packages/1-framework/3-tooling/cli/test/control-api/statements/resolve-model-statements.test.ts
packages/1-framework/3-tooling/cli/test/control-api/statements/resolve-statement-advice.test.ts
packages/1-framework/3-tooling/cli/test/control-api/statements/statement-fixtures.ts
packages/1-framework/3-tooling/cli/test/migration-cli.test.ts
packages/1-framework/3-tooling/cli/test/orm/db-init.test.ts
packages/1-framework/3-tooling/cli/test/orm/db-update.test.ts
packages/1-framework/3-tooling/cli/test/orm/fixtures/offline-project.ts
packages/1-framework/3-tooling/cli/test/orm/migration-plan-statements.test.ts
packages/1-framework/3-tooling/cli/test/statement-errors.test.ts
packages/1-framework/3-tooling/migration/src/aggregate/planner-types.ts
packages/1-framework/3-tooling/migration/src/aggregate/planner.ts
packages/1-framework/3-tooling/migration/src/aggregate/strategies/plan-from-diff.ts
packages/1-framework/3-tooling/migration/src/aggregate/strategies/resolve-recorded-path.ts
packages/1-framework/3-tooling/migration/src/exports/aggregate.ts
packages/1-framework/3-tooling/migration/src/migration-base.ts
packages/1-framework/3-tooling/migration/test/aggregate/planner.test.ts
packages/1-framework/3-tooling/migration/test/aggregate/strategies/plan-from-diff.test.ts
packages/1-framework/3-tooling/migration/test/migration-base.test.ts
packages/2-sql/9-family/src/core/errors.ts
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upgrade-instructions/pending/migration-statement-renames/app/instructions.md
upgrade-instructions/pending/migration-statement-renames/extension/instructions.md

💤 Files with no reviewable changes (4)

skills/journey-tests/02b-rename-with-hint.md
packages/2-sql/9-family/test/apply-table-rename.test.ts
packages/3-targets/3-targets/postgres/src/core/migrations/rename-rls-references.ts
packages/2-sql/9-family/src/core/migrations/apply-table-rename.ts

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… with --rename, instead of dropping it Squash of the 152 commits of #30638 onto main (93b49ce). The unsquashed history is on the branch tml-3475-statement-renames-unsquashed (355cca5). Signed-off-by: willbot <w.a.madden+machine@gmail.com> Signed-off-by: Will Madden <madden@prisma.io>

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

… package migration plan now plans every leg before writing anything, so a refused delta leaves no auto-baseline package on disk. Signed-off-by: willbot <w.a.madden+machine@gmail.com> Signed-off-by: Will Madden <madden@prisma.io>

Merges main, which brings #30606 (autoincrement() on an existing column, and keeping the constraint names Prisma 7 gave a database). Three conflicts: - table-rename-calls.ts: kept this branch's side. Main only swapped constraintRenamesForTableRename for its generalised constraintNameRenames inside postgresTableRenameCalls, which this branch replaced with postgresTableRenameCall and postgresColumnRenameCall over the working schema. Both sides name a renamed constraint the same way: the destination contract's stated name, or else the name derived from the new table name. - table-rename-constraint-renames.ts: main deleted it because constraintNameRenames replaced its only function. This branch rewrote it to pair constraints on the working schema, and the column rename companions share its pairedConstraintRenames, so it stays. It picks up main's stored-name derivation through default-constraint-names.ts. Main's constraint-name-renames.ts stays for the planner's renames of constraints on tables that keep their name. - skills/prisma-8/references/migrations.md: kept both edits to the Columns line: this branch's renameColumn and main's fn('autoincrement()') note on setDefault. Signed-off-by: willbot <w.a.madden+machine@gmail.com> Signed-off-by: Will Madden <madden@prisma.io>

The tests #30606 added call the planner without the origin and statements options this branch made required. They now pass origin: null and an empty statements list. Signed-off-by: willbot <w.a.madden+machine@gmail.com> Signed-off-by: Will Madden <madden@prisma.io>

Main's pass that renames constraints whose names change read the schema from before the plan's rename statements. When a table is renamed and a new table takes its old name, it paired the old table's primary key with the new table's and planned a rename on a table that is only being created. It now reads the working schema, as the rest of the plan does. Signed-off-by: willbot <w.a.madden+machine@gmail.com> Signed-off-by: Will Madden <madden@prisma.io>

… drop is answered with --delete or --rename (prisma#30648) ## At a glance A user deletes the `Legacy` model from the contract source, renames `Profile` to `User`, and plans a migration. They say what they did about `Profile`, but not about `Legacy`: ```text $ prisma migration plan --name tidy-users --rename Profile:User ✖ [CLI.CONSENT_REQUIRED] 1 subject needs a statement, and the session is not interactive. why: Drop table "Legacy" would lose the data of model "Legacy". → Pass --rename 'Legacy:<new name>' → Pass --delete Legacy ``` Nothing is written. Adding `--delete Legacy` writes the plan, and its `Statements applied` block lists `delete model "Legacy" (1 operation)`. When a person runs the same command in a terminal, it asks instead: ```text ? Drop table "Legacy" would lose the data of model "Legacy". (rename Legacy:<new name> or delete) › delete ``` Before this PR, `migration plan` wrote that drop with no question at all, and `db update` asked a single yes/no for the whole plan (`--confirm <database>`). ## The decision `migration plan` and `db update` now refuse any plan that loses data until the user has answered for each operation that loses it: `--delete Legacy` (yes, the data goes) or `--rename Legacy:Archive` (it was a rename; keep the data). There is no longer one consent for the whole plan, and `--confirm` no longer consents to data loss. This builds on prisma#30638 (merged), which added `--rename`. That PR stops the planner dropping a renamed table when the user says it was renamed. This PR closes the other side: when the user says nothing, nothing is lost. ## How it works **1. Which operations count as losing data.** An operation is `destructive` only when it can lose rows or values: dropping a table, a column or a collection, and a type change the database cannot convert without loss. Operations that change structure without losing data are `widening`, and are no longer asked about: `SET NOT NULL`, safe type widenings such as `int4` to `int8` (on `db update` too, read from the live column's type), a SQLite table rebuild that only changes nullability, and MongoDB index and validator changes. **2. What each operation would lose.** The planner result now lists each data-losing operation with the model or field it belongs to, in contract names. It maps table and column names back through the origin contract (the one the database is at now) and through any `--rename` given. Where no contract declares the thing, for example a table an extension's migration drops, it uses the storage name. The framework never sees a table or column; the SQL family and the MongoDB target do the mapping. **3. Asking.** The CLI turns each listed operation into one question and asks them all before anything is written or applied. The answers come from three places, in order: - the command line: `--delete Legacy` or `--rename Legacy:Archive`; - otherwise, when no person is at a terminal (a script, CI, an agent), nothing: the command fails with one error listing every unanswered question and the flag that answers it, as in the example above; - otherwise the person, who types `delete` or `rename Legacy:Archive`. A `rename` typed at the prompt is added to the given renames and the plan is run again. A `--delete` that answers no question fails before anything happens, so a mistyped name never passes silently. A dry run lists the questions, marks which ones the given flags answer, and asks nothing. **4. Who can read the rows (`db update` only).** Dropping a row-level-security policy, or disabling row-level security, loses no data, but it can let more users read or write a table's rows. `db update` asks about each such operation the same way, answered with `--allow User`. `migration plan` does not ask, because the migration is reviewed before it is applied. **5. When `db update` has no origin contract.** `db update` finds the origin contract through the snapshot stored for the database marker's hash. Without one it cannot map tables back to models, so the questions name tables, only `--delete` is offered, and each question gives the steps that store the snapshot so `--rename` becomes possible. **6. The CLI engine change.** The asking, the refusal and the prompt are one mechanism in the shared CLI engine, added in prisma/prisma-cli#337 and released as `@prisma/cli-engine` 0.7.0, which this PR adopts. Each command declares the statements it accepts (`migration plan`: `rename` and `delete`; `db update`: also `allow`). The engine parses those flags for that command only, answers questions from them, and builds the refusal and the prompt. So the flag the refusal tells you to pass is always one the prompt would accept, and vice versa. **7. The control API.** `executeMigrationPlanCommand` and `executeDbUpdate` take a required `answerQuestions` callback. `acceptDataLoss: true` and `acceptAccessWidening: true` answer every question of that kind; `delete` and `allow` entries in `statements` answer one each; an entry that answers nothing fails with `MIGRATION.STATEMENT_ANSWERS_NO_QUESTION`. The whole-plan consent is gone: `MIGRATION.DESTRUCTIVE_CHANGES`, `CONSENT_PLAN_MISMATCH` and the plan-hash round trip. ## What ships - Postgres, SQLite and MongoDB planners: the reclassification and the list of data-losing and access-widening operations. - `migration plan` and `db update`: the questions, `--delete`, `--allow`, the dry-run listing, and `delete` and `allow` lines under `Statements applied`. - Journeys on all three databases (`test/integration/test/cli-journeys/delete-statements-migration*`) and the rewritten consent journeys. - Docs: CLI README, the Statements section of the Migration System doc, the error reference, the CLI Style Guide's consent section, and the `prisma-8` skill. - Upgrade instructions for applications and for extension authors, checked by running them. ## Verification - Architecture and engineering reviews of the whole change, with probes run against PGlite, SQLite and mongodb-memory-server, including the interactive prompt in a pseudo-terminal and table names with shell-special characters. No probe lost a row without a statement, and every printed flag is safe to paste into a shell. - A manual QA run: [report](projects/migration-statements/manual-qa-reports/2026-10-08-qa-slice-2.md). Two pre-existing problems it found are filed: TML-3516 (SQLite autoincrement fails the first `db update` schema check) and TML-3517 (the advice when `SET NOT NULL` fails on existing NULLs). ## Not in this PR - `--delete <namespace>` for a whole namespace: comes with namespace statements. - A refusal that groups its flags per subject instead of one line per flag: an engine follow-up. - A MongoDB validator that newly requires a field leaves existing documents that lack it unwritable, with no warning: comes with MongoDB statements. - `--rename` on MongoDB: still refused, with the steps to keep the documents by hand. - A model that keeps its name but changes `@@map`: no statement; the refusal gives the manual steps. ## Alternatives considered - **Per-operation `--confirm Legacy`, using the engine's existing consent:** needs no engine change, but `--confirm Legacy` does not say what happens to `Legacy`, a misspelled name was silently ignored, and the prompt would still be "type this word to confirm". - **`--delete` parsed by the ORM, outside the engine:** reads the same on the command line, but the ORM would need its own prompt, `--confirm` would still be accepted and do nothing, and `--allow` would need a second mechanism. - **Keep one consent for the whole plan:** one yes cannot say which drops were meant, and a script that passes `--confirm` today would keep losing data it never named. Refs: TML-3476 Agent: beowulf-40  ## Summary by CodeRabbit * **New Features** * Migration planning and database updates identify specific data-loss and access-widening questions. Answer them with `--delete`, `--rename`, or `--allow`, or respond interactively. * Dry runs show which questions need answers and which statements already answer them. * **Behavior Changes** * `--confirm` and `--yes` no longer answer migration consent questions. Unanswered or unused statements are reported. * Migration plans classify changes by impact: value-preserving changes are generally treated as widening, while changes that may lose data are treated as destructive.  --------- Signed-off-by: willbot <w.a.madden+machine@gmail.com> Signed-off-by: Will Madden <madden@prisma.io>

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wmadden-electric changed the base branch from tml-3474-migration-statements to main October 7, 2026 15:40

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TML-3474: shape the migration-statements project: the planner refuses data loss, and the user states renames, deletes, conversions and backfills on the command line #30604

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Comment thread projects/migration-statements/manual-qa-reports/2026-10-07-qa-opus.md

TML-3475: ignore a Gitleaks false positive on constraint names in the…

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

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TML-3476: migration plan and db update refuse to lose data until each drop is answered with --delete or --rename #30648

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wmadden-electric changed the title ~~TML-3475: migration plan and db update rename a model or field stated with --rename, instead of dropping it~~ TML-3475: --rename Profile:User makes migration plan and db update rename a model or field instead of dropping it Oct 8, 2026

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wmadden-electric deleted the tml-3475-statement-renames branch October 8, 2026 05:36

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TML-3474: Plan the rest of the data-loss statements work, and specify --convert, --backfill and MongoDB renames #30666

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TML-3475: --rename Profile:User makes migration plan and db update rename a model or field instead of dropping it - #30638

TML-3475: --rename Profile:User makes migration plan and db update rename a model or field instead of dropping it#30638
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