Session 23: All-day intelligence layer — schedule, game lines, streaks, hot lists, stat filtering, ParlayAPI dead (1567 tests)

src/routes/streaks.js

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+/**
+ * /api/streaks/:sport (Session 23)
+ *
+ * Computed player streaks from cached game logs. NO API calls — reads
+ * warm Redis logs and runs the pure streaks engine over them. Supports
+ * `?stat=points` to narrow to one category, and `?limit=N`.
+ *
+ * Response: { sport, stat, streaks: [...], source: 'computed' }
+ *
+ * An empty `streaks` array is a valid, non-error state — the platform
+ * leans on the other layers (schedule, game lines, props) when no logs
+ * are warm yet.
+ */
+
+const express = require('express');
+const streaksService = require('../services/streaksService');
+const { loadRosterLogs } = require('../services/rosterLogs');
+
+const router = express.Router();
+
+const MISSION_HEADER = { 'X-VYNDR-Mission': 'Streaks are the heartbeat' };
+
+const SUPPORTED = new Set(['nba', 'wnba', 'mlb', 'nfl', 'soccer']);
+
+router.get('/:sport', async (req, res) => {
+  const sport = String(req.params.sport || '').toLowerCase();
+  if (!SUPPORTED.has(sport)) {
+    return res.status(404).set(MISSION_HEADER).json({ error: `No streaks for sport: ${sport}` });
+  }
+  const stat = req.query.stat ? String(req.query.stat).toLowerCase() : 'all';
+  const limit = req.query.limit ? Math.max(0, parseInt(req.query.limit, 10) || 0) : 0;
+
+  try {
+    const roster = await loadRosterLogs(sport);
+    const streaks = streaksService.computeStreaks(roster, sport, { stat, limit });
+    return res.set(MISSION_HEADER).json({ sport, stat, streaks, source: 'computed' });
+  } catch (err) {
+    console.error(`[streaks/${sport}]`, err.message);
+    return res.set(MISSION_HEADER).json({ sport, stat, streaks: [], source: 'computed' });
+  }
+});
+
+module.exports = router;