20260429_232813-fix: video frame display pipeline — default project seed, presigned URLs, Canvas/FrameTimeline real frames, upload-parse flow

backend/routers/projects.py

@@ -9,6 +9,7 @@ from sqlalchemy.orm import Session
 from database import get_db
 from models import Project, Frame
 from schemas import ProjectCreate, ProjectOut, ProjectUpdate, FrameCreate, FrameOut
+from minio_client import get_presigned_url
 
 logger = logging.getLogger(__name__)
 router = APIRouter(prefix="/api/projects", tags=["Projects"])
@@ -40,7 +41,10 @@ def create_project(payload: ProjectCreate, db: Session = Depends(get_db)) -> Pro
 )
 def list_projects(skip: int = 0, limit: int = 100, db: Session = Depends(get_db)) -> List[Project]:
     """Retrieve a paginated list of projects."""
-    return db.query(Project).offset(skip).limit(limit).all()
+    projects = db.query(Project).offset(skip).limit(limit).all()
+    for p in projects:
+        p.frame_count = len(p.frames)
+    return projects
 
 
 @router.get(
@@ -53,6 +57,7 @@ def get_project(project_id: int, db: Session = Depends(get_db)) -> Project:
     project = db.query(Project).filter(Project.id == project_id).first()
     if not project:
         raise HTTPException(status_code=404, detail="Project not found")
+    project.frame_count = len(project.frames)
     return project
 
 
@@ -138,7 +143,7 @@ def list_frames(
     if not project:
         raise HTTPException(status_code=404, detail="Project not found")
 
-    return (
+    frames = (
         db.query(Frame)
         .filter(Frame.project_id == project_id)
         .order_by(Frame.frame_index)
@@ -146,6 +151,9 @@ def list_frames(
         .limit(limit)
         .all()
     )
+    for frame in frames:
+        frame.image_url = get_presigned_url(frame.image_url, expires=3600)
+    return frames
 
 
 @router.get(