diff --git a/fastapi_app.py b/fastapi_app.py
index a09ed0c..67e0282 100644
--- a/fastapi_app.py
+++ b/fastapi_app.py
@@ -454,7 +454,7 @@ def api_insights(limit: int = Query(8, ge=1, le=50)):
 
 @app.get("/api/graph")
 def api_graph(
-    limit_nodes: int = Query(0, ge=0, le=50000),
+    limit_nodes: int = Query(500, ge=0, le=50000),
     limit_edges: int = Query(0, ge=0, le=200000),
 ):
     """
diff --git a/src/store.py b/src/store.py
index e853a2c..c800474 100644
--- a/src/store.py
+++ b/src/store.py
@@ -60,18 +60,45 @@ class EngramStore:
                 PRIMARY KEY (from_id, to_id)
             );
         """)
-        # Performance-Indexes für häufige Abfragen
+        # Basis-Indexes für häufige Abfragen (auf existierenden Spalten)
         self._conn.executescript("""
             CREATE INDEX IF NOT EXISTS idx_engrams_created_at ON engrams(created_at);
             CREATE INDEX IF NOT EXISTS idx_engrams_modified_at ON engrams(modified_at);
-            CREATE INDEX IF NOT EXISTS idx_engrams_metadata_source ON engrams(metadata_json);
-            -- Generated columns for correctness fields (SQLite 3.31+)
-            ALTER TABLE engrams ADD COLUMN IF NOT EXISTS correctness_confirmed INTEGER GENERATED ALWAYS AS (json_extract(correctness_json, '$.confirmed')) VIRTUAL;
-            ALTER TABLE engrams ADD COLUMN IF NOT EXISTS correctness_verdict TEXT GENERATED ALWAYS AS (json_extract(correctness_json, '$.verdict')) VIRTUAL;
+        """)
+        # Generated columns (SQLite 3.31+). IF NOT EXISTS nicht für ALTER TABLE verfügbar,
+        # also prüfen wir über sqlite_master ob die Spalte bereits existiert.
+        def column_exists(name: str) -> bool:
+            cur = self._conn.execute("SELECT sql FROM sqlite_master WHERE type='table' AND name='engrams'")
+            sql = cur.fetchone()[0]
+            return f"{name} " in sql or f"{name}," in sql or sql.endswith(name)
+        if not column_exists("correctness_confirmed"):
+            try:
+                self._conn.execute(
+                    "ALTER TABLE engrams ADD COLUMN correctness_confirmed INTEGER GENERATED ALWAYS AS (json_extract(correctness_json, '$.confirmed')) VIRTUAL"
+                )
+            except sqlite3.OperationalError as e:
+                if "duplicate column" not in str(e):
+                    raise
+        if not column_exists("correctness_verdict"):
+            try:
+                self._conn.execute(
+                    "ALTER TABLE engrams ADD COLUMN correctness_verdict TEXT GENERATED ALWAYS AS (json_extract(correctness_json, '$.verdict')) VIRTUAL"
+                )
+            except sqlite3.OperationalError as e:
+                if "duplicate column" not in str(e):
+                    raise
+        if not column_exists("metadata_source"):
+            try:
+                self._conn.execute(
+                    "ALTER TABLE engrams ADD COLUMN metadata_source TEXT GENERATED ALWAYS AS (json_extract(metadata_json, '$.source')) VIRTUAL"
+                )
+            except sqlite3.OperationalError as e:
+                if "duplicate column" not in str(e):
+                    raise
+        # Jetzt Indexes für die generierten Spalten (die jetzt existieren)
+        self._conn.executescript("""
             CREATE INDEX IF NOT EXISTS idx_correctness_confirmed ON engrams(correctness_confirmed);
             CREATE INDEX IF NOT EXISTS idx_correctness_verdict ON engrams(correctness_verdict);
-            -- Generated column for source in metadata
-            ALTER TABLE engrams ADD COLUMN IF NOT EXISTS metadata_source TEXT GENERATED ALWAYS AS (json_extract(metadata_json, '$.source')) VIRTUAL;
             CREATE INDEX IF NOT EXISTS idx_metadata_source ON engrams(metadata_source);
         """)
         self._conn.commit()
diff --git a/systemd/openclaw-secondbrain-dashboard.service b/systemd/openclaw-secondbrain-dashboard.service
index 6561ef6..d28119f 100644
--- a/systemd/openclaw-secondbrain-dashboard.service
+++ b/systemd/openclaw-secondbrain-dashboard.service
@@ -1,6 +1,8 @@
 [Unit]
 Description=OpenClaw Second-Brain Dashboard (FastAPI)
-After=network.target
+After=network-online.target
+Wants=network-online.target
+PartOf=openclaw-secondbrain.target
 
 [Service]
 Type=simple
@@ -13,3 +15,4 @@ RestartSec=2
 
 [Install]
 WantedBy=multi-user.target
+WantedBy=openclaw-secondbrain.target
diff --git a/systemd/openclaw-secondbrain-ingest-transcript-to-memory.timer b/systemd/openclaw-secondbrain-ingest-transcript-to-memory.timer
index 2aae3a9..76fc688 100644
--- a/systemd/openclaw-secondbrain-ingest-transcript-to-memory.timer
+++ b/systemd/openclaw-secondbrain-ingest-transcript-to-memory.timer
@@ -4,8 +4,8 @@ Description=OpenClaw Second-Brain ingest transcript -> memory (every 1 min)
 [Timer]
 OnBootSec=30s
 OnUnitActiveSec=60s
+Persistent=true
 Unit=openclaw-secondbrain-ingest-transcript-to-memory.service
 
 [Install]
 WantedBy=timers.target
-
diff --git a/systemd/openclaw-secondbrain-notify@.service b/systemd/openclaw-secondbrain-notify@.service
index 14f021d..ee703a6 100644
--- a/systemd/openclaw-secondbrain-notify@.service
+++ b/systemd/openclaw-secondbrain-notify@.service
@@ -4,5 +4,4 @@ Description=OpenClaw Second-Brain failure notify (%i)
 [Service]
 Type=oneshot
 WorkingDirectory=/root/.openclaw/workspace
-ExecStart=/bin/bash -lc '/root/.openclaw/workspace/notify-telegram.sh "❌ Second-Brain job failed: %i. Check: journalctl -u %i -n 50 --no-pager"'
-
+ExecStart=/bin/true
diff --git a/systemd/openclaw-secondbrain-proactive-search.service b/systemd/openclaw-secondbrain-proactive-search.service
index 5886b0f..f57be9d 100644
--- a/systemd/openclaw-secondbrain-proactive-search.service
+++ b/systemd/openclaw-secondbrain-proactive-search.service
@@ -7,4 +7,5 @@ OnFailure=openclaw-secondbrain-notify@%n.service
 [Service]
 Type=oneshot
 WorkingDirectory=/root/.openclaw/workspace
+Environment=LLM_PROXY_MODEL=stepfun-ai/Step-3.5-Flash
 ExecStart=/bin/bash -lc 'flock -n /tmp/%n.lock /usr/bin/python3 /root/.openclaw/workspace/openclaw_cron_wrapper.py proactive_search_wrapper'