feat: indie status page MVP -- FastAPI + SQLite

- 8 DB models (services, incidents, monitors, subscribers, etc.)
- Full CRUD API for services, incidents, monitors
- Public status page with live data
- Incident detail page with timeline
- API key authentication
- Uptime monitoring scheduler
- 13 tests passing
- TECHNICAL_DESIGN.md with full spec

venv/lib/python3.11/site-packages/alembic/util/exc.py

@@ -0,0 +1,43 @@
+from __future__ import annotations
+
+from typing import Any
+from typing import List
+from typing import Tuple
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from alembic.autogenerate import RevisionContext
+
+
+class CommandError(Exception):
+    """Base command error for all exceptions"""
+
+
+class DatabaseNotAtHead(CommandError):
+    """Indicates the database is not at current head revisions.
+
+    Raised by the :func:`.command.current` command when the
+    :paramref:`.command.current.check_heads` parameter is used.
+
+    .. versionadded:: 1.17.1
+
+    """
+
+
+class AutogenerateDiffsDetected(CommandError):
+    """Raised when diffs were detected by the :func:`.command.check`
+    command.
+
+    .. versionadded:: 1.9.0
+
+    """
+
+    def __init__(
+        self,
+        message: str,
+        revision_context: RevisionContext,
+        diffs: List[Tuple[Any, ...]],
+    ) -> None:
+        super().__init__(message)
+        self.revision_context = revision_context
+        self.diffs = diffs