Module migration 

Migration engine ?model snapshot diffing, migration generation, and history tracking.

Corresponds to EFCore’s migration system. Implements full model diffing:

• Detect added/removed tables
• Detect added/removed/altered columns
• Generate Up/Down SQL with dialect-specific type mappings
• Maintain __ef_migrations_history tracking table

Structs

Migration

Represents a single migration with up/down SQL scripts.

MigrationEngine

The migration engine ?compares old and new model snapshots to generate migration SQL.

MigrationHistoryEntry

Represents a record in the migration history table. Table name: __ef_migrations_history Corresponds to EFCore’s __EFMigrationsHistory.

MigrationStore

Reads and writes migration scripts on disk.

ModelSnapshot

A snapshot of the entity model at a point in time. Corresponds to EFCore’s ModelSnapshot.

SnapshotColumn

Serialized form of PropertyMeta for snapshot storage.

SnapshotEntityType

Serialized form of EntityTypeMeta for snapshot storage.

Enums

MigrationDialect

Specifies the database SQL dialect for migration generation.

Constants

MIGRATION_HISTORY_TABLE

Table name for migration history.

PRODUCT_VERSION

Product version recorded in migration history.

Functions

create_migration_history_table_sql

SQL to create the migration history table.

parse_model_snapshot_json

Parses a model snapshot JSON file (same format as MigrationStore::save_snapshot).