feat(solaris): add session models to db

src/utils/db/models/session.py

@@ -0,0 +1,21 @@
+from typing import Annotated, List
+
+from beanie import Document, Indexed
+from google.genai.types import Content
+from pydantic import BaseModel, Field
+
+
+class SessionBase(BaseModel):
+    chat_id: Annotated[int, Indexed(unique=True)]
+    system_prompt: str
+    history: List[Content] = Field(default_factory=list)
+
+
+class ReviewSession(SessionBase, Document):
+    class Settings:
+        name = "review_sessions"
+
+
+class RespondSession(SessionBase, Document):
+    class Settings:
+        name = "respond_sessions"