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migrate-dev-db --source state.sqlite reports success but drops all legacy threads when the source predates V2. A migration-54 fixture containing one project and one thread exits 0 with Repro: 0 threads; the same loss occurs after schema migrations when the server has not imported the legacy thread shells.
Change
Read the source schema, validate pending legacy shell imports, and copy rows in one read-only source transaction. Refuse unsupported legacy data before checkpointing or replacing the destination. The error explains how to import a copy through the server and select the resulting userdata/statev2.sqlite. Empty legacy sources and already-imported V2 sources retain their existing behavior.
Triaged bug via the automated issue flow. This is a focused refusal of a source the command cannot preserve, rather than a second implementation of the server's legacy importer.
Verification
Focused migration suite: 10/10 pass. Regression tests cover populated V1 and migrated-but-unimported V2 sources, typed refusal, and byte-for-byte destination WAL preservation. A deterministic late-write regression commits the first V1 thread after the former preflight boundary; validation now sees the same snapshot as the copy. The V2 fixture includes an already-imported legacy thread to check it remains accepted.
Targeted lint and formatting: pass. Server typecheck: pass.
Two independent final reviews: MERGE, no findings at a007595b42.
The original regression test failed at e0fba36b0d before implementation (assertion: “a source whose threads would be dropped must fail”). Final runtime proof was captured at a007595b42. The late-write regression fails at 44bd595e77 and passes at the current head. Render matrix is empty: CLI-only change, with no web, desktop, or mobile rendering paths. Browser and native client verification do not apply.
Models: Claude Opus 5.5 through the Claude Agent harness; GPT-6.1-Sol through the Codex harness in T3 Code.
Reproduces #19018: a migration-54 source with a projection_threads row
upgrades to an empty V2 projection and the command reports success.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
V1 threads move into the V2 tables at server runtime, not in a migration,
so a pre-V2 source migrated into a dev database with no threads while the
command reported success. Check the source read-only before touching the
destination and fail with MigrateDevDbLegacySourceError when it has no V2
thread table but legacy projection_threads rows. Empty pre-V2 sources and
V2 sources are unchanged.
Fixes#19018
Co-Authored-By: Claude Opus 5.5 <[email protected]>
…e destination
The pre-V2 source check ran after ensureNotInUse, whose TRUNCATE checkpoint
had already rewritten an existing destination's WAL by the time the command
refused. Check the source right after the path guards, before creating the
state directory or opening the destination. The legacy-source test now keeps
a live destination connection open and asserts its WAL bytes are unchanged.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
… threads
The legacy guard returned early once the V2 tables existed, but the server
imports V1 threads at boot rather than in a migration. A source migrated to
V2 without ever booting kept its legacy threads only in projection_threads,
so the copy succeeded with zero threads. Count V1 threads without a V2
thread.created event, as LegacyV1ThreadImporter.pendingThreadCount does,
regardless of schema version. The error now points at the statev2.sqlite a
server leaves behind after importing a copy.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
… index
Without a hint SQLite answers the correlated NOT EXISTS with a per-thread
stream index scan. On 3000 imported threads with 30000 events that took
150-270ms here and 20.7s in review; with the partial index the importer
already names, it takes about 1.5ms. The index ships in the same migration
as the V2 tables the guard checks for.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Macroscope's review found this PR approvable — The development database copier now rejects sources whose legacy threads would otherwise be silently omitted. Validation shares the copy’s read transaction and runs before destination checkpointing or replacement, limiting the change to a protective refusal.
No code changes detected at 3faabde. Prior analysis still applies.
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Walkthrough
The migration now rejects source databases that contain unimported legacy threads. It checks destination use after copying and wraps snapshot SQL errors with the snapshot phase and source path.
Changes: Legacy thread migration guard
Layer / File(s)
Summary
Source snapshot guard and migration error apps/server/scripts/migrate-dev-db.ts
The migration counts legacy threads during source copying. If the V2 projection table exists, it counts threads without a matching V2 thread.created event. Otherwise, it counts all legacy thread rows. A positive count raises MigrateDevDbLegacySourceError. The destination-use check runs after copying, and snapshot SQL errors receive a snapshot-phase error with the source path.
Fixtures and rejection tests apps/server/scripts/migrate-dev-db.test.ts
Fixtures set event versions to V2 and add a V1 legacy thread. Parameterized tests cover pre-V2 sources and V2 sources with unimported legacy threads. They verify that destination WAL bytes remain unchanged after rejection.
The change makes migrate-dev-db refuse sources that contain unimported legacy threads, instead of silently dropping them. No concrete merge-blocking risk remains.
Pre-merge checks: 4
Check name
Status
Explanation
Title check
The title clearly and concisely describes the main change: migrate-dev-db now refuses unimported legacy threads.
Description check
The description includes all required sections and provides clear problem context, implementation details, scope and approval, focused verification results, limitations, and supporting evidence.
Linked Issues check
Issue #19018 requires migrate-dev-db --source to preserve V1 thread data or fail clearly. The production change adds MigrateDevDbLegacySourceError and checks projection_threads in the same sourc…
Out of Scope Changes check
The changes remain within issue #19018. Production edits implement legacy-source detection, transaction consistency, error reporting, and refusal before destination mutation. Test edits add focused fi…
Full details: Linked Issues check
Explanation
Issue #19018 requires migrate-dev-db --source to preserve V1 thread data or fail clearly. The production change adds MigrateDevDbLegacySourceError and checks projection_threads in the same source read transaction as the copy. It rejects populated pre-V2 sources and V2 sources with unimported legacy threads before destination checkpointing. The error provides the server-import recovery path. Tests cover both source states, typed refusal, destination WAL preservation, and an already-imported V2 thread.
Full details: Out of Scope Changes check
Explanation
The changes remain within issue #19018. Production edits implement legacy-source detection, transaction consistency, error reporting, and refusal before destination mutation. Test edits add focused fixtures and regression coverage for the reported data-loss case and its race-related transaction behavior. No unrelated product area or client rendering path changed.
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Actionable comments posted: 1
🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @apps/server/scripts/migrate-dev-db.ts:
- Around line 515-516: Update the migration flow around
ensureNoPendingLegacyThreads and copySourceSlice so the legacy-thread preflight
and source copy operate on one stable source state; either reuse a consistent
snapshot for both or prevent source writes until copying completes, ensuring
newly added legacy threads cannot be omitted from the destination.
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apps/server/scripts/migrate-dev-db.test.ts
apps/server/scripts/migrate-dev-db.ts
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…the guard
An old V1 server on an empty pre-V2 source can create its first thread
after ensureNoPendingLegacyThreads passes but before copySourceSlice reads
the source. The unfiltered copy takes the row, migrations and prune drop
it, and the run exits 0. Red test: the race is injected at the destination
state-dir makeDirectory, the first FileSystem call after the guard.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Confirmed a narrower race at 9bf8c50e9a: an explicitly selected, initially empty V1 source can receive its first legacy thread after preflight. A deterministic regression test commits that row between preflight and copy; the command exits 0 with the late project present and zero threads. A V2 server does not insert legacy rows, but this V1 sequence requires consistent validation and copying.
…wn snapshot
The legacy-thread guard read the source in its own transaction before the
copy, so a V1 server could commit its first thread in between; the
unfiltered copy took it, prune dropped it, and the run exited 0. The check
now runs inside the copy transaction, against the same snapshot as the
schema reads and row copies, and the destination's first busy check
(whose WAL checkpoint rewrites it) moves after the copy so a refusal
still leaves the destination untouched.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Fixed in a007595b42: schema inspection, legacy validation and copying now share one source transaction. Destination checkpointing runs only after successful validation/copy. The deterministic late-write regression fails before this change and passes afterward; all 10 focused tests, lint, formatting and server typecheck pass. Both fresh reviewers returned MERGE.
Merged current main into the fix branch at 5de8830. Resolved the FTS5 copy conflict by keeping main’s shadow-table filtering and index rebuild while moving schema inspection into the same source transaction as legacy validation and copying. Focused migration tests: 10/10 pass; targeted lint and formatting pass. Server typecheck was terminated with exit 143 before producing a result; current-head CI remains the typecheck gate.
Ran the real migration CLI on Linux / Node v26.12.1 in separate worktrees, using identical synthetic sources: one pre-V2 database containing one project and legacy thread, and one schema-migrated database whose legacy shell had never been server-imported. Each destination started with an existing database and uncheckpointed WAL. Used explicit source/destination paths and limits of 5 projects / 10 threads.
Base returned success with zero legacy and zero V2 destination threads, changing destination DB/WAL bytes. Head returned exit 1 with server-import guidance and preserved destination DB/WAL bytes for both source variants. Source bytes remained unchanged throughout.
Images render captured command output, omitting migration lists and stack frames for readability; full sanitized transcripts are linked below.
AI-assisted; verified with the tests and tools listed above.
Not shown:
Did not execute the suggested server-import recovery workflow; verified the refusal, guidance, and preservation of existing destination database and WAL bytes.
Main rewrote the orchestration instructions and delegate_task schema
tersely. Restate the async-first parallel launch guidance in that style,
measure the context budget, and add an eval case for batched waits.
Fixes#23191
AI-assisted; verified with the tests and tools listed above.
The case named #23191, the GitCafe number. On GitHub that is an
unrelated PR; the report is #23175.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Reproduced with the real CLI on Linux in isolated linked worktrees, with no development server running. Both sides used identical synthetic sources containing one legacy project and thread: pre-V2 schema and fully migrated schema without startup import. Ran vp run migrate-dev-db --source <synthetic-source> --base-dir <isolated-destination> --projects 5 --threads-per-project 10, then checked destination rows and database/WAL SHA-256 hashes. Captures use the same 1920×1080 terminal and theme; migration progress is omitted from the displayed summary and retained in the linked full output.
The subsequent server-startup import workflow described by the error guidance was not exercised; this proof covers refusal and destination preservation for both reported legacy source variants.
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Problem
migrate-dev-db --source state.sqlitereports success but drops all legacy threads when the source predates V2. A migration-54 fixture containing one project and one thread exits 0 withRepro: 0 threads; the same loss occurs after schema migrations when the server has not imported the legacy thread shells.Change
Read the source schema, validate pending legacy shell imports, and copy rows in one read-only source transaction. Refuse unsupported legacy data before checkpointing or replacing the destination. The error explains how to import a copy through the server and select the resulting
userdata/statev2.sqlite. Empty legacy sources and already-imported V2 sources retain their existing behavior.Scope and approval
Fixes https://git.cafe/pingdotgg/t3code/issues/19018
Triaged bug via the automated issue flow. This is a focused refusal of a source the command cannot preserve, rather than a second implementation of the server's legacy importer.
Verification
MERGE, no findings at a007595b42.Runtime transcript and standalone synthetic reproduction script.
The original regression test failed at e0fba36b0d before implementation (assertion: “a source whose threads would be dropped must fail”). Final runtime proof was captured at a007595b42. The late-write regression fails at 44bd595e77 and passes at the current head. Render matrix is empty: CLI-only change, with no web, desktop, or mobile rendering paths. Browser and native client verification do not apply.
Models: Claude Opus 5.5 through the Claude Agent harness; GPT-6.1-Sol through the Codex harness in T3 Code.
Fixes #19018