Fix: add index on comment.object_id column (#988)

mwdb/model/comment.py

@@ -10,7 +10,10 @@ class Comment(db.Model):
     timestamp = db.Column(db.DateTime, nullable=False, default=datetime.datetime.utcnow)
 
     object_id = db.Column(
-        db.Integer, db.ForeignKey("object.id", ondelete="CASCADE"), nullable=False
+        db.Integer,
+        db.ForeignKey("object.id", ondelete="CASCADE"),
+        nullable=False,
+        index=True,
     )
     user_id = db.Column(
         db.Integer, db.ForeignKey("user.id", ondelete="SET NULL"), nullable=True

mwdb/model/migrations/versions/2c44b2073670_add_index_on_comment_object_id.py

@@ -0,0 +1,29 @@
+"""Add index on comment.object_id
+
+Revision ID: 2c44b2073670
+Revises: 72a94f88d2b6
+Create Date: 2024-10-04 15:52:04.736269
+
+"""
+import sqlalchemy as sa
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision = "2c44b2073670"
+down_revision = "72a94f88d2b6"
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_index(
+        op.f("ix_comment_object_id"), "comment", ["object_id"], unique=False
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_index(op.f("ix_comment_object_id"), table_name="comment")
+    # ### end Alembic commands ###