新增后台数据库备份与回滚

backend/app/schemas/backup.py

@@ -0,0 +1,26 @@
+from datetime import datetime
+
+from pydantic import BaseModel, Field
+
+
+class CreateDatabaseBackupRequest(BaseModel):
+    reason: str | None = Field(default="manual", max_length=120)
+
+
+class RestoreDatabaseBackupRequest(BaseModel):
+    confirmation: str = Field(min_length=1, max_length=200)
+
+
+class DatabaseBackupOut(BaseModel):
+    filename: str
+    database_type: str
+    created_at: datetime
+    size_bytes: int
+    size_label: str
+    reason: str | None = None
+    note: str | None = None
+
+
+class RestoreDatabaseBackupOut(BaseModel):
+    restored_backup: DatabaseBackupOut
+    pre_restore_backup: DatabaseBackupOut