perf: add PackageKeywords.PackageBaseID index

This is used on the export for package-meta.v1.gz generation

Signed-off-by: Leonidas Spyropoulos <artafinde@archlinux.org>

aurweb/schema.py

@@ -201,6 +201,7 @@ PackageKeywords = Table(
         nullable=False,
         server_default=text("''"),
     ),
+    Index("KeywordsPackageBaseID", "PackageBaseID"),
     mysql_engine="InnoDB",
     mysql_charset="utf8mb4",
     mysql_collate="utf8mb4_general_ci",

migrations/versions/9e3158957fd7_add_packagekeyword_packagebaseuid.py

+"""add PackageKeyword.PackageBaseUID index
+
+Revision ID: 9e3158957fd7
+Revises: 6441d3b65270
+Create Date: 2022-10-17 11:11:46.203322
+
+"""
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision = "9e3158957fd7"
+down_revision = "6441d3b65270"
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    op.create_index(
+        "KeywordsPackageBaseID", "PackageKeywords", ["PackageBaseID"], unique=False
+    )
+
+
+def downgrade():
+    op.drop_index("KeywordsPackageBaseID", table_name="PackageKeywords")