chore: improve postal data import observability

Add progress logging and a status script for postal imports and neighbor builds, and ignore local raw and generated postal datasets.

db/scripts/postal-logging.ts

@@ -0,0 +1,22 @@
+export function createScriptLogger(prefix: string) {
+  const startedAt = Date.now();
+
+  function elapsed() {
+    const totalSeconds = Math.floor((Date.now() - startedAt) / 1000);
+    const minutes = Math.floor(totalSeconds / 60);
+    const seconds = totalSeconds % 60;
+    return `${minutes}m ${seconds}s`;
+  }
+
+  return {
+    info(message: string) {
+      console.log(`[${prefix}] ${message} (${elapsed()})`);
+    },
+    warn(message: string) {
+      console.warn(`[${prefix}] ${message} (${elapsed()})`);
+    },
+    error(message: string) {
+      console.error(`[${prefix}] ${message} (${elapsed()})`);
+    },
+  };
+}