[Backend] Add SECRET credential type for storing generic sensitive values (#4246)

alembic/versions/2025_12_09_1856-1faa2a5869cd_add_secrets_col.py

@@ -0,0 +1,31 @@
+"""add secrets col
+
+Revision ID: 1faa2a5869cd
+Revises: 135afee6e7bc
+Create Date: 2025-12-09 18:56:25.666572+00:00
+
+"""
+
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision: str = "1faa2a5869cd"
+down_revision: Union[str, None] = "135afee6e7bc"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column("credentials", sa.Column("secret_label", sa.String(), nullable=True))
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column("credentials", "secret_label")
+    # ### end Alembic commands ###