Idm 6.41 — Serial Number

/** * POST /serials * Body: prefix?: string * Returns: id, serial */ app.post('/serials', async (req, res) => const prefix = req.body; let serial; let attempts = 0; const maxAttempts = 5;

while (attempts < maxAttempts) serial = buildSerial( prefix ); try const result = await pool.query( `INSERT INTO serial_numbers (serial) VALUES ($1) RETURNING id, serial`, [serial] ); return res.status(201).json(result.rows[0]); catch (err) // 23505 = unique_violation in Postgres if (err.code === '23505') attempts++; continue; // try a new random value console.error(err); return res.status(500).json( error: 'DB error' ); res.status(409).json( error: 'Could not generate unique serial after several tries' ); ); Serial Number Idm 6.41

/** * Utility: builds a serial like "PRD-2024-ABCD-1234" */ function buildSerial( prefix = 'PRD', year = new Date().getFullYear() ) const random = crypto.randomBytes(2).toString('hex').toUpperCase(); // 4 chars const seq = Math.floor(Math.random() * 10000) .toString() .padStart(4, '0'); return `$prefix-$year-$random-$seq`; /** * POST /serials * Body: prefix