diff --git a/YpDaemon/src/worker/sql.rs b/YpDaemon/src/worker/sql.rs
index 923ba49..0fdab0f 100644
--- a/YpDaemon/src/worker/sql.rs
+++ b/YpDaemon/src/worker/sql.rs
@@ -1171,7 +1171,7 @@ pub const QUERY_RANDOM_HEIR: &str = r#"
 
 pub const QUERY_UPDATE_USER_MONEY: &str = r#"
     UPDATE falukant_data.falukant_user
-         SET money     = $1,
+         SET money     = $1::numeric,
              updated_at = NOW()
      WHERE id = $2;
 "#;
diff --git a/YpDaemon/src/worker/user_character.rs b/YpDaemon/src/worker/user_character.rs
index a4c7d0d..01428d1 100644
--- a/YpDaemon/src/worker/user_character.rs
+++ b/YpDaemon/src/worker/user_character.rs
@@ -698,8 +698,16 @@ impl UserCharacterWorker {
             .get()
             .map_err(|e| DbError::new(format!("DB-Verbindung fehlgeschlagen: {e}")))?;
 
+        let clamped = if !new_amount.is_finite() {
+            1000.0
+        } else {
+            const MAX_ABS: f64 = 99_999_999.99;
+            new_amount.clamp(-MAX_ABS, MAX_ABS)
+        };
+        let money_str = format!("{:.2}", clamped);
+
         conn.prepare("update_user_money", QUERY_UPDATE_USER_MONEY)?;
-        conn.execute("update_user_money", &[&new_amount, &falukant_user_id])?;
+        conn.execute("update_user_money", &[&money_str, &falukant_user_id])?;
         Ok(())
     }
 
diff --git a/src/worker/sql.rs b/src/worker/sql.rs
index 348fcb8..afb5786 100644
--- a/src/worker/sql.rs
+++ b/src/worker/sql.rs
@@ -1168,9 +1168,11 @@ pub const QUERY_RANDOM_HEIR: &str = r#"
             chosen.child_character_id;
 "#;
 
+/// Aktualisiert den Geldstand eines Users. $1 = Geld als Text (z. B. "1234.56"), wird als numeric gecastet; $2 = user id.
+/// Verwendung von Text-Parameter vermeidet "error serializing parameter 0" bei f64/numeric.
 pub const QUERY_UPDATE_USER_MONEY: &str = r#"
     UPDATE falukant_data.falukant_user
-         SET money     = $1,
+         SET money     = $1::numeric,
              updated_at = NOW()
      WHERE id = $2;
 "#;
diff --git a/src/worker/user_character.rs b/src/worker/user_character.rs
index 7a0b4a0..1c20f2d 100644
--- a/src/worker/user_character.rs
+++ b/src/worker/user_character.rs
@@ -747,8 +747,17 @@ impl UserCharacterWorker {
             .get()
             .map_err(|e| DbError::new(format!("DB-Verbindung fehlgeschlagen: {e}")))?;
 
+        // Endliche Werte und gültiger Bereich für numeric(10,2), sonst Serialisierungsfehler
+        let clamped = if !new_amount.is_finite() {
+            1000.0
+        } else {
+            const MAX_ABS: f64 = 99_999_999.99;
+            new_amount.clamp(-MAX_ABS, MAX_ABS)
+        };
+        let money_str = format!("{:.2}", clamped);
+
         conn.prepare("update_user_money", QUERY_UPDATE_USER_MONEY)?;
-        conn.execute("update_user_money", &[&new_amount, &falukant_user_id])?;
+        conn.execute("update_user_money", &[&money_str, &falukant_user_id])?;
         Ok(())
     }