Add tern migrate command with up/down subcommands#66
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FEATURE: Add tern migrate up/down commands with tern up/down as aliases Implements the migrate command with two subcommands: - migrate up: Run pending migrations (same as existing up) - migrate down: Revert the most recently applied migration The down command computes inverse operations for reversible migrations and removes the migration record from the database tracking tables. Irreversible operations (like DropTable) will error with a clear message. tern up and tern down are now aliases for tern migrate up/down for convenience.
FEATURE: Store inverse operations in migration files for offline reversal This changes down migrations from being computed on-the-fly at runtime to being computed and persisted when migrations are generated. Key changes: - Rename Migration.operations to up_operations - Add Migration.down_operations field for pre-computed inverse operations - Add src/db/migrate/inverse.rs module for computing inverse operations - Update all migration generation paths (generate, import, init) to compute and store down_operations - Simplify down command to use pre-computed operations - Add is_reversible() method to Migration Breaking change: Migration JSON format now uses up_operations/down_operations instead of operations field.
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FEATURE: Add tern migrate up/down commands with tern up/down as aliases
Implements the migrate command with two subcommands:
The down command computes inverse operations for reversible migrations
and removes the migration record from the database tracking tables.
Irreversible operations (like DropTable) will error with a clear message.
tern up and tern down are now aliases for tern migrate up/down
for convenience.