fix: add necessary indexes for table optimization (#258)

Affects asset_group_collections and asset_group_collection_entries
This migration will also truncate asset_group_collection_entries to
reset table size

cmd/api/src/database/migration/migrations/v5.3.1.sql

@@ -0,0 +1,9 @@
+CREATE INDEX IF NOT EXISTS idx_asset_group_collections_asset_group_id ON asset_group_collections USING btree (asset_group_id);
+CREATE INDEX IF NOT EXISTS idx_asset_group_collections_created_at ON asset_group_collections USING btree (created_at);
+CREATE INDEX IF NOT EXISTS idx_asset_group_collections_updated_at ON asset_group_collections USING btree (updated_at);
+
+CREATE INDEX IF NOT EXISTS idx_asset_group_collection_entries_asset_group_collection_id ON asset_group_collection_entries USING btree (asset_group_collection_id);
+CREATE INDEX IF NOT EXISTS idx_asset_group_collection_entries_created_at ON asset_group_collection_entries USING btree (created_at);
+CREATE INDEX IF NOT EXISTS idx_asset_group_collection_entries_updated_at ON asset_group_collection_entries USING btree (updated_at);
+
+TRUNCATE asset_group_collection_entries;