docs: add granular framework and SQLite emulation comparisons - #176
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Add a source-linked feature guide covering Migrator, FluentMigrator, EF Core, DbUp and Evolve, with additional EF6, grate, RoundhousE, Flyway and Liquibase coverage. Compare authoring, schema operations, migration history, repeatability, transactions, rollback, coordination, deployment and database coverage. Distinguish built-in capabilities from configuration and custom SQL. Document SQLite support operation by operation, including Migrator's table-rebuild emulation, dependency handling and preservation limits. Compare those paths with FluentMigrator and EF Core implementations and manual SQL workflows. Pin inspected source revisions and identify engine-version differences and unverified provider behavior. Link the full guide and SQLite section from the GitHub Pages homepage. Keep all work isolated from the parallel refactoring checkout. Validation: - SQLite suite: 139 passed, 1 existing skipped test, 0 failed. - Validated 69 reference definitions, section anchors and table structure. - Verified both homepage comparison links and git diff --check. - Competitor findings use source/documentation review, not runtime tests.
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Copilot review overview
🟡 Changes recommended
The SQLite documentation needs its preservation and foreign-key restoration qualifications addressed before approval.
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Review effort: Lite
Findings: 2
Open (2)
What changed in this PR
Adds a source-linked migration framework comparison and detailed SQLite emulation guidance, with homepage links to both.
Changes:
- Compares migration frameworks, providers, and operational behavior.
- Documents SQLite rebuild behavior, limitations, and validation scope.
- Links the guide and SQLite section from the homepage.
| File | Summary |
|---|---|
docs/migration-framework-comparison.md |
Adds the framework comparison and SQLite guide. |
docs/index.html |
Adds links to the guide and SQLite section. |
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| | Mapped rows | Named-column `INSERT … SELECT`. | New constraints/types must accept the data. | | ||
| | Names, parsed types, nullability, defaults | Included in column model. | Not a lossless representation of arbitrary CREATE SQL. | | ||
| | Composite PKs | Represented; dedicated rebuild test. | Check membership/order when replacing definitions. | | ||
| | FKs and delete actions | Read from schema/PRAGMA; emitted into replacement DDL. | Not a promise about every clause, e.g. arbitrary deferrability. | |
| | `WITHOUT ROWID`, `STRICT`, generated columns | Not modeled as a complete round-trip contract. | No blanket preservation claim for external schemas. | | ||
| | Hidden `rowid` / AUTOINCREMENT high-water mark | Only mapped columns copied; no explicit sequence-state restoration. | Historical rowid/sequence metadata may change. | | ||
| | Type / length enforcement | Changes declarations, not SQLite typing rules. | Declared size is not SQL Server-like length enforcement. | | ||
| | FK enforcement state | Runner disables before migration and restores after successful execution. | Direct provider calls differ; exception restoration is not proven by success-path tests. | |
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Summary
The homepage comparison is too brief to explain provider-specific behavior or SQLite emulation. Add a detailed, source-linked Markdown guide and link directly to both the full comparison and its SQLite section from the homepage.
This is a documentation-only change, prepared in a separate worktree from the parallel refactoring. The comparison records the inspected implementations; it is not a benchmark or a claim of runtime compatibility across all releases. Homepage links target the guide on master and become available after merge.
Validation
ChangeColumn_RemoveDefaultValue_Success(issue Default value is not reset onChangeColumn#139).git diff --checkpassed.