Add webauthn_credential table

This is to store data for registered webauthn credentials, so
platform admins can later use them to log in.

migrations/versions/0355_add_webauthn_table.py

@@ -0,0 +1,37 @@
+"""
+
+Revision ID: 0355_add_webauthn_table
+Revises: 0354_government_channel
+Create Date: 2021-05-07 17:04:22.017137
+
+"""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+revision = '0355_add_webauthn_table'
+down_revision = '0354_government_channel'
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table(
+        'webauthn_credential',
+        sa.Column('credential_id', postgresql.UUID(as_uuid=True), nullable=False),
+        sa.Column('aaguid', postgresql.UUID(as_uuid=True), nullable=False),
+        sa.Column('public_key', sa.String(), nullable=False),
+        sa.Column('user_id', postgresql.UUID(as_uuid=True), nullable=False),
+        sa.Column('registration_response', postgresql.JSONB(none_as_null=True, astext_type=sa.Text()), nullable=False),
+        sa.Column('created_at', sa.DateTime(), nullable=False),
+        sa.Column('updated_at', sa.DateTime(), nullable=True),
+        sa.ForeignKeyConstraint(['user_id'], ['users.id'], ),
+        sa.PrimaryKeyConstraint('credential_id', 'user_id')
+    )
+    # ### end Alembic commands ###
+
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table('webauthn_credential')
+    # ### end Alembic commands ###