- Added new section on schema file organization, detailing principles and decision criteria for merging or separating table files.
- Updated file naming conventions for single and multi-table files, as well as helper utilities.
- Refactored import paths in various schema files to use the new `_columnHelpers` module instead of the deprecated `columnHelpers`.
- Removed obsolete `customSql.ts`, `columnHelpers.ts`, `messageFts.ts`, `tag.ts`, `entityTag.ts`, and other related files to streamline the codebase.
This refactor improves clarity in database schema management and aligns file organization with best practices.
