Add per-role badge colors

migrations/versions/7d27_roles_color.py

@@ -0,0 +1,49 @@
+"""Add roles.color for per-role badge colors
+
+Roles rendered as gray badges everywhere except admin (hardcoded). Give each
+role an optional CSS color, matching how statuses/types carry a color column,
+so role badges are visually distinct and admin-editable.
+
+Idempotent guard on column presence; real downgrade drops the column.
+
+Revision ID: 7d27_roles_color
+Revises: 7d26_settings_description_text
+Create Date: 2026-07-20
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+revision = '7d27_roles_color'
+down_revision = '7d26_settings_description_text'
+branch_labels = None
+depends_on = None
+
+
+def _has_color(insp):
+    return any(c['name'] == 'color' for c in insp.get_columns('roles'))
+
+
+def upgrade():
+    bind = op.get_bind()
+    insp = sa.inspect(bind)
+
+    if 'roles' not in insp.get_table_names():
+        return
+    if _has_color(insp):
+        return
+
+    op.add_column('roles', sa.Column('color', sa.String(length=20), nullable=True))
+
+
+def downgrade():
+    bind = op.get_bind()
+    insp = sa.inspect(bind)
+
+    if 'roles' not in insp.get_table_names():
+        return
+    if not _has_color(insp):
+        return
+
+    op.drop_column('roles', 'color')