diff --git a/runtime/lib/activity_gate.py b/runtime/lib/activity_gate.py
index f98de7d..23184ab 100644
--- a/runtime/lib/activity_gate.py
+++ b/runtime/lib/activity_gate.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python3
-"""Debounce Nextcloud activity and request a periodic safety reconciliation."""
+"""Debounce Nextcloud activity for one connector scope."""
 
 from __future__ import annotations
 
@@ -24,54 +24,117 @@ def validate_view(name: str) -> str:
     return value
 
 
+def sql_literal(value: str) -> str:
+    return "'" + str(value).replace("'", "''") + "'"
+
+
 def load(path: Path) -> dict[str, object]:
-    defaults: dict[str, object] = {"processed":0,"observed":0,"pending_since":0,"last_change":0,"last_full":0,"source_signature":""}
+    defaults: dict[str, object] = {
+        "processed": 0, "observed": 0, "pending_since": 0,
+        "last_change": 0, "last_full": 0, "source_signature": "",
+    }
     if not path.exists():
         return defaults
-    data=json.loads(path.read_text(encoding="utf-8"))
-    return {"processed":int(data.get("processed",0)),"observed":int(data.get("observed",0)),"pending_since":int(data.get("pending_since",0)),"last_change":int(data.get("last_change",0)),"last_full":int(data.get("last_full",0)),"source_signature":str(data.get("source_signature",""))}
+    data = json.loads(path.read_text(encoding="utf-8"))
+    return {
+        "processed": int(data.get("processed", 0)),
+        "observed": int(data.get("observed", 0)),
+        "pending_since": int(data.get("pending_since", 0)),
+        "last_change": int(data.get("last_change", 0)),
+        "last_full": int(data.get("last_full", 0)),
+        "source_signature": str(data.get("source_signature", "")),
+    }
 
 
 def save(path: Path, state: dict[str, object]) -> None:
-    path.parent.mkdir(parents=True,exist_ok=True)
-    fd,name=tempfile.mkstemp(dir=path.parent)
-    with os.fdopen(fd,"w",encoding="utf-8") as handle:
-        json.dump(state,handle,sort_keys=True);handle.write("\n")
+    path.parent.mkdir(parents=True, exist_ok=True)
+    fd, name = tempfile.mkstemp(dir=path.parent)
+    with os.fdopen(fd, "w", encoding="utf-8") as handle:
+        json.dump(state, handle, sort_keys=True)
+        handle.write("\n")
     Path(name).replace(path)
 
 
 def query(args: argparse.Namespace, sql: str) -> str:
-    env=os.environ.copy();env["PGPASSWORD"]=args.password_file.read_text(encoding="utf-8").strip()
-    command=["psql","-XAt","-h",args.host,"-p",str(args.port),"-U",args.user,"-d",args.database,"-v","ON_ERROR_STOP=1","-c",sql]
-    return subprocess.run(command,env=env,check=True,text=True,capture_output=True).stdout
+    env = os.environ.copy()
+    env["PGPASSWORD"] = args.password_file.read_text(encoding="utf-8").strip()
+    command = [
+        "psql", "-XAt", "-h", args.host, "-p", str(args.port),
+        "-U", args.user, "-d", args.database, "-v", "ON_ERROR_STOP=1", "-c", sql,
+    ]
+    return subprocess.run(command, env=env, check=True, text=True, capture_output=True).stdout
+
+
+def user_where(args: argparse.Namespace) -> str:
+    if not args.access_user:
+        return ""
+    return " WHERE lower(access_user) = lower(" + sql_literal(args.access_user) + ")"
 
 
 def latest(args: argparse.Namespace) -> int:
-    return int(query(args,f"SELECT COALESCE(MAX(activity_id), 0) FROM {validate_view(args.view)}").strip())
+    view = validate_view(args.view)
+    return int(query(args, f"SELECT COALESCE(MAX(activity_id), 0) FROM {view}{user_where(args)}").strip())
 
 
 def source_signature(args: argparse.Namespace) -> str:
-    if not args.source_view:return ""
-    payload=query(args,f"SELECT share_id, display_name, storage_id, source_path FROM {validate_view(args.source_view)} ORDER BY share_id")
+    if args.roots_config:
+        return hashlib.sha256(args.roots_config.read_bytes()).hexdigest()
+    if not args.source_view:
+        return ""
+    view = validate_view(args.source_view)
+    payload = query(args, f"SELECT share_id, display_name, storage_id, source_path FROM {view}{user_where(args)} ORDER BY share_id")
     return hashlib.sha256(payload.encode("utf-8")).hexdigest()
 
 
 def main() -> int:
-    parser=argparse.ArgumentParser();parser.add_argument("action",choices=("check","commit"));parser.add_argument("--state",required=True,type=Path);parser.add_argument("--host",required=True);parser.add_argument("--port",type=int,default=5432);parser.add_argument("--database",required=True);parser.add_argument("--user",required=True);parser.add_argument("--password-file",required=True,type=Path);parser.add_argument("--view",default="piwigo_showcase_activity");parser.add_argument("--source-view",default="");parser.add_argument("--quiet",type=int,default=120);parser.add_argument("--max-wait",type=int,default=900);parser.add_argument("--full-after",type=int,default=86400);args=parser.parse_args()
+    parser = argparse.ArgumentParser()
+    parser.add_argument("action", choices=("check", "commit"))
+    parser.add_argument("--state", required=True, type=Path)
+    parser.add_argument("--host", required=True)
+    parser.add_argument("--port", type=int, default=5432)
+    parser.add_argument("--database", required=True)
+    parser.add_argument("--user", required=True)
+    parser.add_argument("--password-file", required=True, type=Path)
+    parser.add_argument("--view", required=True)
+    parser.add_argument("--source-view", default="")
+    parser.add_argument("--roots-config", type=Path)
+    parser.add_argument("--access-user", default="")
+    parser.add_argument("--quiet", type=int, default=120)
+    parser.add_argument("--max-wait", type=int, default=900)
+    parser.add_argument("--full-after", type=int, default=86400)
+    args = parser.parse_args()
     try:
         validate_view(args.view)
-        if args.source_view:validate_view(args.source_view)
-        state=load(args.state);now=int(time.time());current=latest(args);current_source=source_signature(args)
-        if args.action=="commit":state.update(processed=current,observed=current,pending_since=0,last_change=0,last_full=now,source_signature=current_source);save(args.state,state);return 0
-        if not int(state["last_full"]):return 0
-        if current_source and current_source!=str(state["source_signature"]):return 0
-        if current>int(state["observed"]):state["observed"]=current;state["last_change"]=now;state["pending_since"]=int(state["pending_since"]) or now;save(args.state,state)
-        if now-int(state["last_full"])>=args.full_after:return 0
-        if int(state["observed"])<=int(state["processed"]):return 3
-        if now-int(state["last_change"])>=args.quiet or now-int(state["pending_since"])>=args.max_wait:return 0
+        if args.source_view:
+            validate_view(args.source_view)
+        state = load(args.state)
+        now = int(time.time())
+        current = latest(args)
+        current_source = source_signature(args)
+        if args.action == "commit":
+            state.update(processed=current, observed=current, pending_since=0, last_change=0, last_full=now, source_signature=current_source)
+            save(args.state, state)
+            return 0
+        if not int(state["last_full"]):
+            return 0
+        if current_source and current_source != str(state["source_signature"]):
+            return 0
+        if current > int(state["observed"]):
+            state["observed"] = current
+            state["last_change"] = now
+            state["pending_since"] = int(state["pending_since"]) or now
+            save(args.state, state)
+        if now - int(state["last_full"]) >= args.full_after:
+            return 0
+        if int(state["observed"]) <= int(state["processed"]):
+            return 3
+        if now - int(state["last_change"]) >= args.quiet or now - int(state["pending_since"]) >= args.max_wait:
+            return 0
         return 3
     except Exception as error:
-        print(f"activity-gate: {error}",file=sys.stderr);return 1
+        print(f"activity-gate: {error}", file=sys.stderr)
+        return 1
 
 
-if __name__=="__main__":raise SystemExit(main())
+if __name__ == "__main__":
+    raise SystemExit(main())