Add default protocol recurrence

If a meeting has a regular interval (e.g. weekly or biweekly), setting the protocoltype recurrence interval simplifies generating regular protocols. If recurrence is set and no [sitzung;…]-tag is given in the protocol, a new protocol will be created on date+recurrence days on protocol upload, provided this date is still in the future.

migrations/versions/da846db78ff9_.py

+"""empty message
+
+Revision ID: da846db78ff9
+Revises: 7834767242e8
+Create Date: 2022-10-29 19:24:42.934124
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = 'da846db78ff9'
+down_revision = '7834767242e8'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('protocoltypes', sa.Column('recurrence', sa.Integer(), nullable=True))
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column('protocoltypes', 'recurrence')
+    # ### end Alembic commands ###