feat: show tasks completed today

migrations/versions/0018_task_completed_at.py

@@ -0,0 +1,26 @@
+"""add task completed_at timestamp
+
+Revision ID: 0018_task_completed_at
+Revises: 0017_memos
+"""
+
+import sqlalchemy as sa
+from alembic import op
+
+revision = "0018_task_completed_at"
+down_revision = "0017_memos"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    with op.batch_alter_table("tasks") as batch_op:
+        batch_op.add_column(sa.Column("completed_at", sa.DateTime(timezone=True), nullable=True))
+        batch_op.create_index("ix_tasks_completed_at", ["completed_at"])
+    op.execute("UPDATE tasks SET completed_at = updated_at WHERE completed IS TRUE AND completed_at IS NULL")
+
+
+def downgrade() -> None:
+    with op.batch_alter_table("tasks") as batch_op:
+        batch_op.drop_index("ix_tasks_completed_at")
+        batch_op.drop_column("completed_at")