fix(db): upsert_node Race-Condition behoben (UNIQUE constraint)

INSERT OR IGNORE + UPDATE statt SELECT → INSERT eliminiert den
UNIQUE-constraint-Fehler bei konkurrierenden async-Aufrufen.

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

CHANGELOG.md

@@ -1,5 +1,12 @@
 # Changelog
 
+## [0.08.20] - 2026-02-20
+
+### Fixed
+- **`upsert_node` Race-Condition** (`UNIQUE constraint failed: nodes.node_id`):
+  Statt SELECT → INSERT nutzt die Methode jetzt `INSERT OR IGNORE` + `UPDATE`,
+  wodurch konkurrierende Aufrufe keinen Constraint-Fehler mehr auslösen.
+
 ## [0.08.19] - 2026-02-20
 
 ### Added

config/config.yaml

@@ -1,4 +1,4 @@
-version: "0.08.19"
+version: "0.08.20"
 
 bot:
   name: "MeshDD-Bot"

meshbot/database.py

@@ -129,29 +129,19 @@ class Database:
 
     async def upsert_node(self, node_id: str, **kwargs) -> dict:
         now = time.time()
-        existing = await self.get_node(node_id)
+        # Row anlegen falls nicht vorhanden (first_seen nur beim ersten Mal gesetzt)
-
+        await self.db.execute(
-        if existing:
+            "INSERT OR IGNORE INTO nodes (node_id, first_seen, last_seen) VALUES (?, ?, ?)",
-            updates = {k: v for k, v in kwargs.items() if v is not None}
+            (node_id, now, now),
-            if not updates:
+        )
-                return dict(existing)
+        # Nicht-None-Felder + last_seen immer aktualisieren
-            updates["last_seen"] = now
+        updates = {k: v for k, v in kwargs.items() if v is not None}
-            set_clause = ", ".join(f"{k} = ?" for k in updates)
+        updates["last_seen"] = now
-            values = list(updates.values()) + [node_id]
+        set_clause = ", ".join(f"{k} = ?" for k in updates)
-            await self.db.execute(
+        values = list(updates.values()) + [node_id]
-                f"UPDATE nodes SET {set_clause} WHERE node_id = ?", values
+        await self.db.execute(
-            )
+            f"UPDATE nodes SET {set_clause} WHERE node_id = ?", values
-        else:
+        )
-            kwargs["node_id"] = node_id
-            kwargs.setdefault("first_seen", now)
-            kwargs["last_seen"] = now
-            cols = ", ".join(kwargs.keys())
-            placeholders = ", ".join("?" for _ in kwargs)
-            await self.db.execute(
-                f"INSERT INTO nodes ({cols}) VALUES ({placeholders})",
-                list(kwargs.values()),
-            )
-
         await self.db.commit()
         return dict(await self.get_node(node_id))