- Created a new JSON file for the City entity's AST representation, detailing its methods and properties.
- Added a migration to alter the cities table by adding a nullable title column.
- Implemented export functionality to retrieve all rows from specified category tables.
- Developed import functionality with strict validation and referential integrity checks.
- Added error handling for various import scenarios including invalid formats and duplicate entries.
- Introduced tests for import functionality to ensure correct behavior and validation.
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