Add creation date to User table

data/database.py

@@ -441,6 +441,8 @@ class User(BaseModel):
 
   maximum_queued_builds_count = IntegerField(null=True)
 
+  creation_date = DateTimeField(default=datetime.utcnow, null=True)
+
   def delete_instance(self, recursive=False, delete_nullable=False):
     # If we are deleting a robot account, only execute the subset of queries necessary.
     if self.robot:

data/migrations/versions/0cf50323c78b_add_creation_date_to_user_table.py

@@ -0,0 +1,26 @@
+"""Add creation date to User table
+
+Revision ID: 0cf50323c78b
+Revises: 87fbbc224f10
+Create Date: 2018-03-09 13:19:41.903196
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '0cf50323c78b'
+down_revision = '87fbbc224f10'
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade(tables):
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('user', sa.Column('creation_date', sa.DateTime(), nullable=True))
+    # ### end Alembic commands ###
+
+
+def downgrade(tables):
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column('user', 'creation_date')
+    # ### end Alembic commands ###