perf(backend): index roms (platform_id, fs_size_bytes)

backend/alembic/versions/0097_roms_platform_fs_size_index.py

@@ -0,0 +1,33 @@
+"""Add composite index on roms (platform_id, fs_size_bytes)
+
+Revision ID: 0097_roms_platform_fs_size_index
+Revises: 0096_fix_virtual_collections
+Create Date: 2026-07-16 00:00:00.000000
+
+"""
+
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision = "0097_roms_platform_fs_size_index"
+down_revision = "0096_fix_virtual_collections"
+branch_labels = None
+depends_on = None
+
+INDEX_NAME = "idx_roms_platform_fs_size"
+INDEX_COLUMNS = ["platform_id", "fs_size_bytes"]
+
+
+def upgrade() -> None:
+    with op.batch_alter_table("roms", schema=None) as batch_op:
+        batch_op.create_index(
+            INDEX_NAME,
+            INDEX_COLUMNS,
+            unique=False,
+            if_not_exists=True,
+        )
+
+
+def downgrade() -> None:
+    with op.batch_alter_table("roms", schema=None) as batch_op:
+        batch_op.drop_index(INDEX_NAME, if_exists=True)

backend/models/rom.py

@@ -268,6 +268,7 @@ class Rom(BaseModel):
             "tgdb_id",
             "id",
         ),
+        Index("idx_roms_platform_fs_size", "platform_id", "fs_size_bytes"),
         Index("idx_roms_name", "name"),
         Index("idx_roms_name_sort_key", "name_sort_key"),
         Index("idx_roms_igdb_id", "igdb_id"),