fix(db): bootstrap the panel-access schema (users.username, user_panels, user_project_members, projects planning columns)

The pm branch's model expects these but nothing created them — login 500s
with UndefinedColumnError users.username on any volume that predates the
RBAC work, including fresh ones (migration.sql never had the column
either). The pm author evidently altered his local DB by hand.

ensure_rbac_schema() now creates all of it idempotently at startup,
alongside the audit/bot_drafts/project_transfers ensures.

backend/app/db/init_db.py

@@ -414,6 +414,50 @@ async def ensure_drop_category_tables(engine: AsyncEngine) -> None:
     logger.info("category taxonomy tables dropped (attributes / ref units / conversions)")
 
 
+async def ensure_rbac_schema(engine: AsyncEngine) -> None:
+    """Panel-access schema (pm branch): users.username, projects planning
+    columns, user_panels and user_project_members. Idempotent; safe on any
+    volume — the RBAC model expects these and login 500s without them."""
+    stmts = (
+        "ALTER TABLE users ADD COLUMN IF NOT EXISTS username TEXT",
+        "ALTER TABLE projects ADD COLUMN IF NOT EXISTS location TEXT DEFAULT ''",
+        "ALTER TABLE projects ADD COLUMN IF NOT EXISTS project_manager TEXT DEFAULT ''",
+        "ALTER TABLE projects ADD COLUMN IF NOT EXISTS planned_start DATE",
+        "ALTER TABLE projects ADD COLUMN IF NOT EXISTS planned_end DATE",
+        "ALTER TABLE projects ADD COLUMN IF NOT EXISTS actual_start DATE",
+        "ALTER TABLE projects ADD COLUMN IF NOT EXISTS actual_end DATE",
+        "ALTER TABLE projects ADD COLUMN IF NOT EXISTS status TEXT DEFAULT 'ACTIVE'",
+        "ALTER TABLE projects ADD COLUMN IF NOT EXISTS progress DOUBLE PRECISION DEFAULT 0.0",
+        "ALTER TABLE projects ADD COLUMN IF NOT EXISTS updated_at TIMESTAMPTZ DEFAULT now()",
+        """
+        CREATE TABLE IF NOT EXISTS user_panels (
+            id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+            user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+            panel TEXT NOT NULL,
+            level TEXT NOT NULL,
+            created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+            CONSTRAINT uq_user_panel UNIQUE (user_id, panel)
+        )
+        """,
+        "CREATE INDEX IF NOT EXISTS ix_user_panels_user_id ON user_panels(user_id)",
+        """
+        CREATE TABLE IF NOT EXISTS user_project_members (
+            id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+            user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+            project_id UUID NOT NULL REFERENCES projects(id) ON DELETE CASCADE,
+            created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+            CONSTRAINT uq_user_project_member UNIQUE (user_id, project_id)
+        )
+        """,
+        "CREATE INDEX IF NOT EXISTS ix_user_project_members_user_id ON user_project_members(user_id)",
+        "CREATE INDEX IF NOT EXISTS ix_user_project_members_project_id ON user_project_members(project_id)",
+    )
+    async with engine.begin() as conn:
+        for stmt in stmts:
+            await conn.execute(text(stmt))
+    logger.info("RBAC schema ensured (username / project columns / user_panels / user_project_members)")
+
+
 async def ensure_audit_table(engine: AsyncEngine) -> None:
     """v2.7: general activity trail (audit_log). Idempotent; safe on any volume."""
     ddl = """

backend/app/main.py

@@ -32,6 +32,7 @@ from app.db.init_db import (
     ensure_dashboard_tables,
     ensure_material_topic_column,
     ensure_quote_projects,
+    ensure_rbac_schema,
     ensure_project_transfers_table,
     ensure_v26,
 )
@@ -107,6 +108,7 @@ async def lifespan(_app: FastAPI):
     await ensure_material_topic_column(engine)
     await ensure_quote_projects(engine)
     await ensure_v26(engine)
+    await ensure_rbac_schema(engine)
     await ensure_audit_table(engine)
     await ensure_drop_category_tables(engine)
     await ensure_bot_drafts_table(engine)