Add an SQL DB abstraction layer

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

src/sql/util.ts

@@ -0,0 +1,14 @@
+import { randomBytes } from "crypto";
+
+export function generateId(): bigint {
+  const buf = randomBytes(8);
+
+  buf[0] &= 0x7f; // Force number to be non-negative
+
+  // Let's not depend on Node v12 for the sake of 3 LoC just yet.
+
+  const hi = buf.readUInt32BE(0);
+  const lo = buf.readUInt32BE(4);
+
+  return (BigInt(hi) << 32n) | BigInt(lo);
+}