fix: use alphanumeric password instead of hexadecimal

- Use upper/lower/numeric (a-z, A-Z, 0-9) for better entropy
- Still avoids special characters that cause shell escaping issues
- More secure than hexadecimal-only passwords

Author: claudfuen

apps/infra/modules/database.ts

@@ -6,15 +6,14 @@ import { CommonConfig, NetworkOutputs } from "../types";
 export function createDatabase(config: CommonConfig, network: NetworkOutputs) {
   const { commonTags } = config;
 
-  // Generate a secure random password for the database (hexadecimal only - no special chars)
+  // Generate a secure random password for the database (alphanumeric only - no special chars)
   const dbPassword = new random.RandomPassword("pathfinder-db-password", {
     length: 32,
     special: false,
-    upper: false,
-    lower: false,
-    numeric: false,
-    // Use only hexadecimal characters (0-9, a-f)
-    overrideSpecial: "0123456789abcdef",
+    upper: true,
+    lower: true,
+    numeric: true,
+    // No override needed - upper/lower/numeric gives us alphanumeric
   });
 
   // Create AWS Secret for database credentials (will be populated after RDS instance is created)