feat: add postgres storage and remote sync

core/models.py

@@ -0,0 +1,18 @@
+from dataclasses import dataclass, field
+from typing import Any, Dict, List, Optional
+
+
+Entity = Dict[str, Any]
+
+
+@dataclass
+class PageRecord:
+    page_number: int
+    text: str
+    entities: List[Entity] = field(default_factory=list)
+
+
+@dataclass
+class BotResponse:
+    text: str
+    pages: Optional[List[PageRecord]] = None