diff --git a/src/agents/claude_client.py b/src/agents/claude_client.py
index 3282cba..661180d 100644
--- a/src/agents/claude_client.py
+++ b/src/agents/claude_client.py
@@ -41,12 +41,14 @@ class UsageAccumulator:
 async def call_claude(prompt: str, tools: str | None = "WebSearch,WebFetch", model: str | None = None) -> tuple[str, ClaudeUsage]:
     """Ruft Claude CLI auf. Gibt (result_text, usage) zurück.
 
+    Prompt wird via stdin uebergeben um OS ARG_MAX Limits zu vermeiden.
+
     Args:
-        prompt: Der Prompt für Claude
+        prompt: Der Prompt fuer Claude
         tools: Kommagetrennte erlaubte Tools (None = keine Tools, --max-turns 1)
-        model: Optionales Modell (z.B. CLAUDE_MODEL_FAST für Haiku). None = CLI-Default (Opus).
+        model: Optionales Modell (z.B. CLAUDE_MODEL_FAST fuer Haiku). None = CLI-Default (Opus).
     """
-    cmd = [CLAUDE_PATH, "-p", prompt, "--output-format", "json"]
+    cmd = [CLAUDE_PATH, "-p", "-", "--output-format", "json"]
     if model:
         cmd.extend(["--model", model])
     if tools:
@@ -56,6 +58,7 @@ async def call_claude(prompt: str, tools: str | None = "WebSearch,WebFetch", mod
 
     process = await asyncio.create_subprocess_exec(
         *cmd, stdout=asyncio.subprocess.PIPE, stderr=asyncio.subprocess.PIPE,
+        stdin=asyncio.subprocess.PIPE,
         env={
             "PATH": "/usr/local/bin:/usr/bin:/bin",
             "HOME": "/home/claude-dev",
@@ -64,7 +67,9 @@ async def call_claude(prompt: str, tools: str | None = "WebSearch,WebFetch", mod
         },
     )
     try:
-        stdout, stderr = await asyncio.wait_for(process.communicate(), timeout=CLAUDE_TIMEOUT)
+        stdout, stderr = await asyncio.wait_for(
+            process.communicate(input=prompt.encode("utf-8")), timeout=CLAUDE_TIMEOUT
+        )
     except asyncio.TimeoutError:
         process.kill()
         raise TimeoutError(f"Claude CLI Timeout nach {CLAUDE_TIMEOUT}s")
diff --git a/src/database.py b/src/database.py
index eb4ff00..2e95118 100644
--- a/src/database.py
+++ b/src/database.py
@@ -350,6 +350,26 @@ async def init_db():
             await db.execute("ALTER TABLE fact_checks ADD COLUMN tenant_id INTEGER REFERENCES organizations(id)")
             await db.commit()
 
+        # Migration: status_history fuer fact_checks (Faktencheck-Verlauf)
+        if "status_history" not in fc_columns:
+            await db.execute("ALTER TABLE fact_checks ADD COLUMN status_history TEXT DEFAULT '[]'")
+            # Bestehende Eintraege initialisieren
+            cursor2 = await db.execute("SELECT id, status, checked_at FROM fact_checks")
+            for row2 in await cursor2.fetchall():
+                import json as _json
+                initial_history = _json.dumps([{"status": row2[1], "at": str(row2[2])}])
+                await db.execute("UPDATE fact_checks SET status_history = ? WHERE id = ?", (initial_history, row2[0]))
+            await db.commit()
+            logger.info("Migration: status_history zu fact_checks hinzugefuegt")
+
+        # Migration: category fuer article_locations (Marker-Klassifizierung)
+        cursor = await db.execute("PRAGMA table_info(article_locations)")
+        al_columns = [row[1] for row in await cursor.fetchall()]
+        if "category" not in al_columns:
+            await db.execute("ALTER TABLE article_locations ADD COLUMN category TEXT DEFAULT 'mentioned'")
+            await db.commit()
+            logger.info("Migration: category zu article_locations hinzugefuegt")
+
         # Migration: tenant_id fuer incident_snapshots
         cursor = await db.execute("PRAGMA table_info(incident_snapshots)")
         snap_columns2 = [row[1] for row in await cursor.fetchall()]