Refactor park filtering system and templates

- Updated the filtered_list.html template to extend from base/base.html and improved layout and styling.
- Removed the park_list.html template as its functionality is now integrated into the filtered list.
- Added a new migration to create indexes for improved filtering performance on the parks model.
- Merged migrations to maintain a clean migration history.
- Implemented a ParkFilterService to handle complex filtering logic, aggregations, and caching for park filters.
- Enhanced filter suggestions and popular filters retrieval methods.
- Improved the overall structure and efficiency of the filtering system.

parks/migrations/0001_add_filter_indexes.py

@@ -0,0 +1,62 @@
+# Generated manually for enhanced filtering performance
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    atomic = False  # Required for CREATE INDEX CONCURRENTLY
+
+    dependencies = [
+        ('parks', '0001_initial'),  # Adjust this to the latest migration
+    ]
+
+    operations = [
+        # Add indexes for commonly filtered fields
+        migrations.RunSQL(
+            "CREATE INDEX CONCURRENTLY IF NOT EXISTS parks_park_status_idx ON parks_park (status);",
+            reverse_sql="DROP INDEX IF EXISTS parks_park_status_idx;",
+        ),
+        migrations.RunSQL(
+            "CREATE INDEX CONCURRENTLY IF NOT EXISTS parks_park_operator_id_idx ON parks_park (operator_id);",
+            reverse_sql="DROP INDEX IF EXISTS parks_park_operator_id_idx;",
+        ),
+        migrations.RunSQL(
+            "CREATE INDEX CONCURRENTLY IF NOT EXISTS parks_park_average_rating_idx ON parks_park (average_rating);",
+            reverse_sql="DROP INDEX IF EXISTS parks_park_average_rating_idx;",
+        ),
+        migrations.RunSQL(
+            "CREATE INDEX CONCURRENTLY IF NOT EXISTS parks_park_size_acres_idx ON parks_park (size_acres);",
+            reverse_sql="DROP INDEX IF EXISTS parks_park_size_acres_idx;",
+        ),
+        migrations.RunSQL(
+            "CREATE INDEX CONCURRENTLY IF NOT EXISTS parks_park_coaster_count_idx ON parks_park (coaster_count);",
+            reverse_sql="DROP INDEX IF EXISTS parks_park_coaster_count_idx;",
+        ),
+        migrations.RunSQL(
+            "CREATE INDEX CONCURRENTLY IF NOT EXISTS parks_park_ride_count_idx ON parks_park (ride_count);",
+            reverse_sql="DROP INDEX IF EXISTS parks_park_ride_count_idx;",
+        ),
+        migrations.RunSQL(
+            "CREATE INDEX CONCURRENTLY IF NOT EXISTS parks_park_updated_at_idx ON parks_park (updated_at);",
+            reverse_sql="DROP INDEX IF EXISTS parks_park_updated_at_idx;",
+        ),
+        # Composite indexes for common filter combinations
+        migrations.RunSQL(
+            "CREATE INDEX CONCURRENTLY IF NOT EXISTS parks_park_status_rating_idx ON parks_park (status, average_rating);",
+            reverse_sql="DROP INDEX IF EXISTS parks_park_status_rating_idx;",
+        ),
+        migrations.RunSQL(
+            "CREATE INDEX CONCURRENTLY IF NOT EXISTS parks_park_operator_status_idx ON parks_park (operator_id, status);",
+            reverse_sql="DROP INDEX IF EXISTS parks_park_operator_status_idx;",
+        ),
+        # Index for parks with coasters (coaster_count > 0)
+        migrations.RunSQL(
+            "CREATE INDEX CONCURRENTLY IF NOT EXISTS parks_park_has_coasters_idx ON parks_park (coaster_count) WHERE coaster_count > 0;",
+            reverse_sql="DROP INDEX IF EXISTS parks_park_has_coasters_idx;",
+        ),
+        # Index for big parks (ride_count >= 10)
+        migrations.RunSQL(
+            "CREATE INDEX CONCURRENTLY IF NOT EXISTS parks_park_big_parks_idx ON parks_park (ride_count) WHERE ride_count >= 10;",
+            reverse_sql="DROP INDEX IF EXISTS parks_park_big_parks_idx;",
+        ),
+    ]

parks/migrations/0005_merge_20250820_2020.py

@@ -0,0 +1,13 @@
+# Generated by Django 5.2.5 on 2025-08-21 00:20
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("parks", "0001_add_filter_indexes"),
+        ("parks", "0004_fix_pghistory_triggers"),
+    ]
+
+    operations = []