Add an SQL DB abstraction layer

Because what self-respecting Enterprise(R) project doesn't have
one of those?

src/model.ts

@@ -1 +1,12 @@
+import { randomBytes } from "crypto";
+
 export type AimeId = number & { __aimeId: null };
+
+/** Generate a random 32-bit ID for use in external protocol messages */
+export function generateExtId(): number {
+  const buf = randomBytes(4);
+
+  buf[0] &= 0x7f; // Force number to be non-negative
+
+  return buf.readUInt32BE(0);
+}