feat: initial commit of AI Comic Generator

backend/app/routers/history.py

@@ -0,0 +1,38 @@
+from fastapi import APIRouter, Depends, HTTPException
+from sqlmodel import Session, select
+from app.core.database import get_session
+from app.models.models import ImageHistory, Character, StoryboardItem
+
+router = APIRouter()
+
+@router.get("/{entity_type}/{entity_id}")
+def get_history(entity_type: str, entity_id: int, session: Session = Depends(get_session)):
+    # entity_type: 'character' or 'panel'
+    statement = select(ImageHistory).where(
+        ImageHistory.entity_type == entity_type,
+        ImageHistory.entity_id == entity_id
+    ).order_by(ImageHistory.created_at.desc())
+    history = session.exec(statement).all()
+    return history
+
+@router.post("/select/{history_id}")
+def select_image(history_id: int, session: Session = Depends(get_session)):
+    history = session.get(ImageHistory, history_id)
+    if not history:
+        raise HTTPException(status_code=404, detail="History item not found")
+        
+    if history.entity_type == "character":
+        entity = session.get(Character, history.entity_id)
+    elif history.entity_type == "panel": 
+        entity = session.get(StoryboardItem, history.entity_id)
+    else:
+        raise HTTPException(status_code=400, detail="Unknown entity type")
+        
+    if not entity:
+         raise HTTPException(status_code=404, detail="Entity not found")
+         
+    entity.image_url = history.image_url
+    session.add(entity)
+    session.commit()
+    session.refresh(entity)
+    return {"status": "success", "image_url": entity.image_url}