- Added crime summary by type CSV file with district-wise crime statistics.
- Added yearly crime data CSV file with detailed crime statistics per district and year.
- Modified the database schema to include a new column `source_type` in the `crimes` table and a new column `distance` in the `locations` table.
- Created migration to add `location_logs` table for tracking user location data with relevant fields and indices.
- Updated migration to drop the `distance` column and replace it with `distance_from_unit` in the `locations` table.
- Added additional migrations to drop and recreate the `location_logs` table, modify existing columns, and enforce new constraints in the `unit_statistics` and `units` tables.
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