Database Indexes and Optimizations for Performance


**Description:**
Add necessary indexes for fast queries.

**Tasks:**
- [ ] PostGIS spatial index on coordinates
- [ ] Index on parent_id for child queries
- [ ] Index on score for filtering
- [ ] Index on place_type
- [ ] Run EXPLAIN ANALYZE on key queries

**Acceptance Criteria:**
- All main queries use indexes
- Query times <100ms for typical searches