Implement simple locking system for environments

alembic/versions/691b04ecd85e_add_environment_claimed_at.py

@@ -0,0 +1,28 @@
+"""add Environment claimed_at
+
+Revision ID: 691b04ecd85e
+Revises: cfab6c8243cb
+Create Date: 2019-09-13 11:51:24.677399
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '691b04ecd85e' # pragma: allowlist secret
+down_revision = 'cfab6c8243cb' # pragma: allowlist secret
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('environments', sa.Column('claimed_at', sa.TIMESTAMP(timezone=True), nullable=True))
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column('environments', 'claimed_at')
+    # ### end Alembic commands ###