v0.71.0: admin panel — users table, login/sessions, generic DB CRUD modal

lib/db/client.ts

@@ -62,8 +62,36 @@ CREATE TABLE IF NOT EXISTS sim_state (
   last_real_tick_ms INTEGER NOT NULL DEFAULT 0,
   last_selected_time_scale REAL NOT NULL DEFAULT 1
 );
+-- v0.71.0: accounts + login sessions for the admin panel (and later multiplayer auth).
+CREATE TABLE IF NOT EXISTS users (
+  id TEXT PRIMARY KEY NOT NULL,
+  username TEXT NOT NULL UNIQUE,
+  password_hash TEXT NOT NULL,
+  admin INTEGER NOT NULL DEFAULT 0,
+  created_at INTEGER NOT NULL
+);
+CREATE TABLE IF NOT EXISTS sessions (
+  id TEXT PRIMARY KEY NOT NULL,
+  user_id TEXT NOT NULL,
+  expires_at INTEGER NOT NULL
+);
 `;
 
+// v0.71.0: the seeded admin's scrypt hash (salt$hex). The plaintext exists only in the
+// operator's head — never in code, tests or comments; login verifies against this string.
+const ADMIN_SEED_HASH = '8dbed630b49a15073e8be571367c1858$0e5207dae2e3c813a7172a5f610fd47a90e8ff17513180ab1e0a7779c3766ef0';
+
+// v0.71.0: idempotent admin seed — runs on every open(), no-ops when the row exists, so
+// pre-existing production DBs gain exactly one admin row and never a duplicate.
+function seedAdminUser(raw: RawSqlJsDatabase): void {
+  raw.run(
+    `INSERT INTO users (id, username, password_hash, admin, created_at)
+     SELECT 'admin-kamilkrzywda', 'kamilkrzywda', ?, 1, ?
+     WHERE NOT EXISTS (SELECT 1 FROM users WHERE username = 'kamilkrzywda')`,
+    [ADMIN_SEED_HASH, Date.now()],
+  );
+}
+
 // v0.7.0: DBs created by earlier versions lack the new columns; CREATE TABLE IF
 // NOT EXISTS won't add them, so ALTER (guarded by PRAGMA table_info). Fresh DBs
 // already have everything from DDL above and this is a no-op for them.
@@ -161,6 +189,7 @@ async function open(file: string): Promise<GameDb> {
   const raw = bytes ? new SQL.Database(new Uint8Array(bytes)) : new SQL.Database();
   raw.exec(DDL); // no-op for tables that already exist in an older file
   migrateColumns(raw);
+  seedAdminUser(raw); // v0.71.0 — idempotent; safe on pre-existing production DBs
 
   // v0.12.0: run BEFORE the seed check — a pre-v0.12.0 file has account rows, so
   // without this it would keep the dead contracts table forever.