refactor: [PPT-2299] add bookings query indexes

migration/db/migrations/20251211120000000_optimize_bookings_query_indexes.sql

@@ -0,0 +1,47 @@
+-- +micrate Up
+-- SQL in section 'Up' is executed when this migration is applied
+
+-- Drop the existing HASH index on tenant_id and replace with BTREE for better range query support
+DROP INDEX IF EXISTS bookings_tenant_id_idx;
+CREATE INDEX IF NOT EXISTS bookings_tenant_id_btree_idx ON bookings USING BTREE (tenant_id);
+
+-- Create a composite index for the most common query pattern:
+-- tenant_id + booking_type + deleted + time range queries
+CREATE INDEX IF NOT EXISTS bookings_tenant_type_deleted_time_idx 
+  ON bookings USING BTREE (tenant_id, booking_type, deleted, booking_start, booking_end)
+  WHERE deleted = FALSE;
+
+-- Create a GIN index for zones array with additional conditions
+-- This helps with the "ANY (zones)" queries
+CREATE INDEX IF NOT EXISTS bookings_zones_gin_idx 
+  ON bookings USING GIN (zones)
+  WHERE deleted = FALSE AND checked_out_at IS NULL;
+
+-- Create a composite index for recurring bookings queries
+CREATE INDEX IF NOT EXISTS bookings_recurring_lookup_idx
+  ON bookings USING BTREE (tenant_id, recurrence_type, recurrence_end, booking_start)
+  WHERE deleted = FALSE AND rejected_at IS NULL AND deleted_at IS NULL;
+
+-- Create a partial index for active bookings (not checked out, not deleted)
+CREATE INDEX IF NOT EXISTS bookings_active_idx
+  ON bookings USING BTREE (tenant_id, booking_type, booking_start, booking_end)
+  WHERE deleted = FALSE AND checked_out_at IS NULL;
+
+-- Create a composite index specifically for the zone + type + time range query pattern
+CREATE INDEX IF NOT EXISTS bookings_tenant_type_time_zones_idx
+  ON bookings USING BTREE (tenant_id, booking_type, booking_start, booking_end)
+  INCLUDE (zones, recurrence_type, recurrence_end, rejected_at, deleted_at, checked_out_at)
+  WHERE deleted = FALSE;
+
+-- +micrate Down
+-- SQL section 'Down' is executed when this migration is rolled back
+
+DROP INDEX IF EXISTS bookings_tenant_type_time_zones_idx;
+DROP INDEX IF EXISTS bookings_active_idx;
+DROP INDEX IF EXISTS bookings_recurring_lookup_idx;
+DROP INDEX IF EXISTS bookings_zones_gin_idx;
+DROP INDEX IF EXISTS bookings_tenant_type_deleted_time_idx;
+DROP INDEX IF EXISTS bookings_tenant_id_btree_idx;
+
+-- Restore the original HASH index
+CREATE INDEX IF NOT EXISTS bookings_tenant_id_idx ON bookings USING HASH (tenant_id);