release: bump version to 0.52.0

backend/app/api/v1/vessels.py

@@ -0,0 +1,39 @@
+"""Bounded vessel snapshot APIs for viewport-first consumers."""
+
+from typing import Optional
+
+from fastapi import APIRouter, Depends, HTTPException, Query
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.api.v1.visualization import _parse_bbox, build_vessel_snapshot_response
+from app.db.session import get_db
+from app.services.vessel_ais_aggregation import MAX_SNAPSHOT_LIMIT
+
+router = APIRouter()
+
+
+@router.get("/snapshot")
+async def get_vessel_snapshot(
+    bbox: Optional[str] = Query(None, description="Viewport bbox as lon_min,lat_min,lon_max,lat_max"),
+    zoom: int = Query(..., ge=1, le=20, description="Current map zoom level"),
+    type: Optional[str] = Query(
+        None,
+        description="Comma-separated vessel types: cargo,tanker,passenger,fishing,military,other",
+    ),
+    limit: int = Query(1000, ge=1, le=MAX_SNAPSHOT_LIMIT),
+    since_minutes: int = Query(60, ge=1, le=1440),
+    db: AsyncSession = Depends(get_db),
+):
+    if not bbox:
+        raise HTTPException(status_code=400, detail="bbox is required")
+    parsed_bbox = _parse_bbox(bbox)
+    if parsed_bbox is None:
+        raise HTTPException(status_code=400, detail="bbox is required")
+    return await build_vessel_snapshot_response(
+        db,
+        bbox=parsed_bbox,
+        zoom=zoom,
+        type_filter=type,
+        limit=limit,
+        since_minutes=since_minutes,
+    )