Add change log entry for TEXT column migration

changelog.d/20250114_114726_jsick_DM_48413.md

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+<!-- Delete the sections that don't apply -->
+
+### Backwards-incompatible changes
+
+- Migrate the database to use `TEXT` column types where previously we used `VARCHAR` columns with a (now unnecessary) length limit. **This change requires a database migration on deployment**. In Postgres there is no functional or performance difference between `VARCHAR` and `TEXT` columns. This change simplifies the database schema and reduce the risk of future issues with column length limits.
+
+### New features
+
+-
+
+### Bug fixes
+
+- In the `cli` tox environment, fix the name of the executable to be `times-square` rather than `timessquare`.
+
+### Other changes
+
+- Improved the developer documentation for database migration to concretely provide copy-and-pastable commands for preparinug and running database migrations.