[JanJakes]

ALTER TABLE, OPTIMIZE TABLE, and REPAIR TABLE can reset a table's AUTO_INCREMENT counter when rebuilding it. For example, if IDs 1, 2, and 3 were inserted and 3 was deleted, rebuilding the table can cause the next insert to reuse 3 instead of assigning 4. Empty tables can also lose a configured starting value such as AUTO_INCREMENT = 1000.

This change preserves the counter during table rebuilds, including the upgrade migration introduced in #542. It handles regular and temporary tables and keeps explicit AUTO_INCREMENT changes working.

Fixes #544

Summary by CodeRabbit

• Bug Fixes
  • Table rebuilds now preserve AUTO_INCREMENT values, including after rows are deleted or a rebuild fails.
  • Explicit next-ID settings and separate sequences for temporary and persistent tables are retained.
  • AUTO_INCREMENT values remain intact across table changes, optimization, and repair operations.
  • Configuration changes that normalize zero dates no longer reset AUTO_INCREMENT values.

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• packages/mysql-on-sqlite/src/sqlite/class-wp-mysql-on-sqlite.php

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• packages/mysql-on-sqlite/src/sqlite/class-wp-mysql-on-sqlite.php

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📝 Walkthrough

Table reconstruction now preserves the original table’s AUTO_INCREMENT sequence when the applicable SQLite schema has a sqlite_sequence table. Tests cover rebuild operations and configuration normalization.

Changes: AUTO_INCREMENT Preservation

Layer / File(s)	Summary
Restore the sequence during reconstruction packages/mysql-on-sqlite/src/sqlite/class-wp-mysql-on-sqlite.php, packages/mysql-on-sqlite/tests/WP_MySQL_On_SQLite_Translation_Tests.php	Reconstruction checks the applicable main or temp schema for sqlite_sequence. If it exists, reconstruction raises the replacement table’s sequence to at least the original table’s value. Translation expectations include the schema lookup.
Cover rebuild and configuration scenarios packages/mysql-on-sqlite/tests/WP_MySQL_On_SQLite_Metadata_Tests.php, packages/mysql-on-sqlite/tests/WP_MySQL_On_SQLite_Tests.php	Tests cover sequence preservation across rebuild operations, explicit sequence options, table-name variations, temporary and persistent tables, tables without auto-increment columns, failed rebuilds, and temporal-default normalization.

Priority: ➖ Normal

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

Change: Bug fix · Severity of issue fixed: Medium

Possibly related issues

• ALTER TABLE and OPTIMIZE TABLE reset the AUTO_INCREMENT counter #544 — The issue reports that table rebuilds reset AUTO_INCREMENT counters. This change preserves the counter during reconstruction.

Possibly related PRs

• WordPress/sqlite-database-integration#560 — This PR updates the same reconstruction path and can rebuild tables while restoring metadata.
• WordPress/sqlite-database-integration#555 — Its ALTER COLUMN operations use table reconstruction, where this change preserves the counter.
• WordPress/sqlite-database-integration#542 — Its temporal-default migration rebuilds tables; this change tests counter preservation during configuration normalization.

Merge Risk: ⚪ Minimal · up to 270d7

The reported empty-table counter-loss concern is resolved by the rebuild’s existing copy-and-update sequence. No actionable merge-blocking risk remains after normal checks.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 14.29% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 21 functions across 3 files.	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 and concisely describes the main change: preserving AUTO_INCREMENT counters during table rebuilds.
Linked Issues check		Issue #544 requires ALTER TABLE and OPTIMIZE TABLE rebuilds to preserve AUTO_INCREMENT counters, including deleted-ID gaps and configured starting values. The shared `recreate_table_from_informa…
Out of Scope Changes check		The changes remain within issue #544 and the current PR scope. The implementation supports the same counter-preservation behavior for REPAIR TABLE. The added regression tests and translation expecta…

Full details: Linked Issues check

Explanation

Issue #544 requires ALTER TABLE and OPTIMIZE TABLE rebuilds to preserve AUTO_INCREMENT counters, including deleted-ID gaps and configured starting values. The shared recreate_table_from_information_schema() path preserves the original sqlite_sequence value and keeps a higher value reached by copied rows. The change covers persistent and temporary tables, explicit counter options, and failed rebuilds. Tests cover add-column, modify-column, OPTIMIZE, and the related temporal-default upgrade migration from #542. The current PR description also includes REPAIR TABLE, and the tests cover that operation.

Full details: Out of Scope Changes check

Explanation

The changes remain within issue #544 and the current PR scope. The implementation supports the same counter-preservation behavior for REPAIR TABLE. The added regression tests and translation expectation updates directly validate the implementation. No unrelated product behavior or unrelated files appear in the supplied change summary.

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Actionable comments posted: 1

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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
@packages/mysql-on-sqlite/src/sqlite/class-wp-mysql-on-sqlite.php:
- Line 5788: Update the table-rebuild sequence around execute_sqlite_query to
insert the original sqlite_sequence counter for the replacement table when no
sequence row exists, and update an existing row without lowering a higher
counter created by copied rows. Do this before dropping the original table so
empty-table rebuilds preserve the next AUTOINCREMENT value.

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• packages/mysql-on-sqlite/src/sqlite/class-wp-mysql-on-sqlite.php
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