Remove redundant dag_id index on log table (#42376)

This index is not needed because there's another index on the table that leads with dag_id.

airflow/migrations/versions/0033_3_0_0_remove_redundant_index.py

@@ -0,0 +1,49 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+"""
+Remove redundant index.
+
+Revision ID: 16cbcb1c8c36
+Revises: 522625f6d606
+Create Date: 2024-09-20 09:32:48.707545
+
+"""
+
+from __future__ import annotations
+
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision = "16cbcb1c8c36"
+down_revision = "522625f6d606"
+branch_labels = None
+depends_on = None
+airflow_version = "3.0.0"
+
+
+def upgrade():
+    """Apply Remove redundant index."""
+    with op.batch_alter_table("log", schema=None) as batch_op:
+        batch_op.drop_index("idx_log_dag")
+
+
+def downgrade():
+    """Unapply Remove redundant index."""
+    with op.batch_alter_table("log", schema=None) as batch_op:
+        batch_op.create_index("idx_log_dag", ["dag_id"], unique=False)

airflow/models/log.py

@@ -49,7 +49,6 @@ class Log(Base):
     try_number = Column(Integer)
 
     __table_args__ = (
-        Index("idx_log_dag", dag_id),
         Index("idx_log_dttm", dttm),
         Index("idx_log_event", event),
         Index("idx_log_task_instance", dag_id, task_id, run_id, map_index, try_number),

airflow/utils/db.py

@@ -96,7 +96,7 @@ class MappedClassProtocol(Protocol):
     "2.9.0": "1949afb29106",
     "2.9.2": "686269002441",
     "2.10.0": "22ed7efa9da2",
-    "3.0.0": "522625f6d606",
+    "3.0.0": "16cbcb1c8c36",
 }
 
 

docs/apache-airflow/img/airflow_erd.sha256

@@ -1 +1 @@
-d58a76011bd215ac7a0c42146986ad0eead5f4a9c8ffd7932b1aa1eb61e6e4af
+f4379048d3f13f35aaba824c00450c17ad4deea9af82b5498d755a12f8a85a37