feat: refactor parsing and scanning logic for test files

- Updated `parseFilename` to `parseTargetFilename` and modified its return structure to include `test_id` instead of `file_id`.
- Introduced `parseResultFilename` to extract `test_id` and `device` from result file names.
- Enhanced `fullScan` to separately handle target and results directories, improving clarity and functionality.
- Updated database interactions to use `test_id` instead of `file_id` across various modules.
- Added a new `/rescan` endpoint to trigger a full scan of target and results directories.
- Improved logging and error handling throughout the scanning process.
- Introduced `parseTputRssi` to extract throughput and RSSI data from log files.

server/index.js

@@ -5,9 +5,9 @@ const cors    = require('cors');
 const path    = require('path');
 const fs      = require('fs');
 
-const { getConfig }    = require('./db');
+const { getConfig, countTests }    = require('./db');
 const { fullScan }     = require('./scanner');
-const { startWatching } = require('./watcher');
+const { startWatching } = require('./watcher')
 
 const app  = express();
 const PORT = process.env.PORT || 3001;
@@ -35,11 +35,16 @@ async function start() {
   const resultsDir = getConfig('results_dir');
 
   if (targetDir && resultsDir) {
-    console.log('[server] Scanning directories...');
-    await fullScan(targetDir, resultsDir);
-    const { getAllTests } = require('./db');
-    const tests = getAllTests();
-    console.log(`[server] Startup scan complete — ${tests.length} tests found, ${tests.filter(t => t.completed).length} completed`);
+    const existing = countTests();
+    if (existing > 0) {
+      console.log(`[server] Resuming from DB — ${existing} tests already loaded.`);
+    } else {
+      console.log('[server] No cached data, scanning directories...');
+      await fullScan(targetDir, resultsDir);
+      const { getAllTests } = require('./db');
+      const tests = getAllTests();
+      console.log(`[server] Scan complete — ${tests.length} tests found, ${tests.filter(t => t.completed).length} completed`);
+    }
     startWatching(targetDir, resultsDir);
     console.log('[server] Watching for changes.');
   } else {