Migrate snapshot storage from IndexedDB to server-side JSON files (v2.0.0)

Snapshots are now stored as individual JSON files on the server under
data/snapshots/, making them persistent across browsers and resilient
to browser data loss. Existing IndexedDB data is auto-migrated on
first load.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

snapshot_routes.py

@@ -0,0 +1,111 @@
+"""
+HTTP route handlers for snapshot storage.
+
+Registers endpoints with PromptServer.instance.routes at import time.
+"""
+
+from aiohttp import web
+from server import PromptServer
+
+from . import snapshot_storage as storage
+
+routes = PromptServer.instance.routes
+
+
+@routes.post("/snapshot-manager/save")
+async def save_snapshot(request):
+    try:
+        data = await request.json()
+        record = data.get("record")
+        if not record or "id" not in record or "workflowKey" not in record:
+            return web.json_response({"error": "Missing record with id and workflowKey"}, status=400)
+        storage.put(record)
+        return web.json_response({"ok": True})
+    except ValueError as e:
+        return web.json_response({"error": str(e)}, status=400)
+    except Exception as e:
+        return web.json_response({"error": str(e)}, status=500)
+
+
+@routes.post("/snapshot-manager/list")
+async def list_snapshots(request):
+    try:
+        data = await request.json()
+        workflow_key = data.get("workflowKey")
+        if not workflow_key:
+            return web.json_response({"error": "Missing workflowKey"}, status=400)
+        records = storage.get_all_for_workflow(workflow_key)
+        return web.json_response(records)
+    except Exception as e:
+        return web.json_response({"error": str(e)}, status=500)
+
+
+@routes.post("/snapshot-manager/delete")
+async def delete_snapshot(request):
+    try:
+        data = await request.json()
+        workflow_key = data.get("workflowKey")
+        snapshot_id = data.get("id")
+        if not workflow_key or not snapshot_id:
+            return web.json_response({"error": "Missing workflowKey or id"}, status=400)
+        storage.delete(workflow_key, snapshot_id)
+        return web.json_response({"ok": True})
+    except ValueError as e:
+        return web.json_response({"error": str(e)}, status=400)
+    except Exception as e:
+        return web.json_response({"error": str(e)}, status=500)
+
+
+@routes.post("/snapshot-manager/delete-all")
+async def delete_all_snapshots(request):
+    try:
+        data = await request.json()
+        workflow_key = data.get("workflowKey")
+        if not workflow_key:
+            return web.json_response({"error": "Missing workflowKey"}, status=400)
+        result = storage.delete_all_for_workflow(workflow_key)
+        return web.json_response(result)
+    except Exception as e:
+        return web.json_response({"error": str(e)}, status=500)
+
+
+@routes.get("/snapshot-manager/workflows")
+async def list_workflows(request):
+    try:
+        keys = storage.get_all_workflow_keys()
+        return web.json_response(keys)
+    except Exception as e:
+        return web.json_response({"error": str(e)}, status=500)
+
+
+@routes.post("/snapshot-manager/prune")
+async def prune_snapshots(request):
+    try:
+        data = await request.json()
+        workflow_key = data.get("workflowKey")
+        max_snapshots = data.get("maxSnapshots")
+        if not workflow_key or max_snapshots is None:
+            return web.json_response({"error": "Missing workflowKey or maxSnapshots"}, status=400)
+        deleted = storage.prune(workflow_key, int(max_snapshots))
+        return web.json_response({"deleted": deleted})
+    except Exception as e:
+        return web.json_response({"error": str(e)}, status=500)
+
+
+@routes.post("/snapshot-manager/migrate")
+async def migrate_snapshots(request):
+    try:
+        data = await request.json()
+        records = data.get("records")
+        if not isinstance(records, list):
+            return web.json_response({"error": "Missing records array"}, status=400)
+        imported = 0
+        for record in records:
+            if "id" in record and "workflowKey" in record:
+                storage.put(record)
+                imported += 1
+        return web.json_response({"imported": imported})
+    except ValueError as e:
+        return web.json_response({"error": str(e)}, status=400)
+    except Exception as e:
+        return web.json_response({"error": str(e)}, status=500)