feat: Update database schema to allow nullable year in crimes table
feat: Create test table for future use in migrations
feat: Add crime_cleared column to crimes table and drop test table
feat: Add city_id column to units table and adjust district_id constraints
feat: Add phone column to units table
feat: Add avg_crime column to crimes table
feat: Implement seeder for crime incidents with detailed mock data generation
feat: Add trigger and function for calculating distance to district's police unit
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