* Introduce `--flatten-schema` flag to convert, merge, and split commands.
* Modify database writing functions to support flattened schema names.
* Update template functions to handle schema.table naming convention.
* Enhance PostgreSQL writer to utilize flattened schema in generated SQL.
* Update tests to ensure compatibility with new flattening feature.
* Dependencies updated for improved functionality.
* Update model name generation to include schema name.
* Add gofmt execution after writing output files.
* Refactor relationship field naming to include schema.
* Update tests to reflect changes in model names and relationships.
* Update relationship field naming conventions for has-one and has-many relationships.
* Implement logic to ensure unique field names by tracking used names.
* Add tests to verify new naming conventions and uniqueness constraints.
* Refactor generateRelationshipFieldName to use foreign key columns for unique naming.
* Add test for multiple references to the same table to ensure unique relationship field names.
* Update existing tests to reflect new naming convention.
* Implement SanitizeFilename function to clean identifiers
* Remove quotes, comments, and invalid characters from filenames
* Update filename generation in writers to use sanitized names
* Introduced GUID field to Database, Domain, DomainTable, Schema, Table, View, Sequence, Column, Index, Relationship, Constraint, Enum, and Script models.
* Updated initialization functions to assign new GUIDs using uuid package.
* Enhanced DCTX reader and writer to utilize GUIDs from models where available.
