refactor(ts): day 4 — middleware + utils + db .js → .ts (24 files)

All remaining backend files renamed:
  src/middleware/auth.ts, logging.ts (2 files)
  src/utils/*.ts         (20 files: ai, auditQueue, config, crypto,
                          embeddings, errors, fileType, logger, models,
                          notify, passwords, platform, promptSafe,
                          prompts, redact, sessions, transcribe*,
                          ttsGoogle)
  src/db/database.ts, migrate.ts (2 files)

Spot-fixes to satisfy tsc (all within the spirit of 'no behavior
change' — added `: any` annotations where the original JS relied on
duck typing that tsc's default inference narrows too aggressively):

  utils/ai.ts — body, converseParams, request literals + fallback
    result object + err.code/model/message casts. AI client has lots
    of provider-specific ad-hoc object shapes; Day 5 will replace the
    `any`s with proper provider-response interfaces.
  utils/embeddings.ts — payload + request as `any`; generateEmbedding
    call sites pass `undefined as any` for the now-required second
    arg (model) until we refactor the signature.
  utils/prompts.ts — PROMPTS typed as Record<string, any> so
    .loadFromDb / .updatePrompt / .getAllPrompts attachments after
    the const literal compile.
  utils/transcribeLocal.ts — buildArgs() has two `var args = [...]`
    in the same function scope (var-hoisted); both now typed as
    any[] so they don't type-clash across conditionals.

Backend is now 54 of 54 TypeScript files, permissive mode.
`npm run typecheck` EXIT 0. Prod container still running the old
JS image — no Dockerfile change yet.

Next: Day 5 flips strict: true, fixes every error tsc surfaces, adds
Vitest + Zod + Knip tooling.

src/utils/ai.ts

@@ -223,7 +223,7 @@ async function callBedrock(messages, model, temperature, maxTokens) {
   if (isAnthropic) {
     // Anthropic Messages API format (native, best performance)
     var InvokeModelCommand = BedrockModule.InvokeModelCommand;
-    var body = {
+    var body: any = {
       anthropic_version: 'bedrock-2023-05-31',
       max_tokens: maxTokens,
       temperature: temperature,
@@ -279,7 +279,7 @@ async function callBedrock(messages, model, temperature, maxTokens) {
       return { role: m.role, content: [{ text: m.content }] };
     });
 
-    var converseParams = {
+    var converseParams: any = {
       modelId: modelId,
       messages: converseMessages,
       inferenceConfig: {
@@ -346,7 +346,7 @@ async function callVertex(messages, model, temperature, maxTokens) {
     }
   });
 
-  var request = { contents: contents };
+  var request: any = { contents: contents };
   if (systemInstruction) {
     request.systemInstruction = { parts: [{ text: systemInstruction }] };
   }
@@ -418,8 +418,8 @@ async function callAI(messages, options) {
       var allowed = await getAllowedModelIds(db);
       if (allowed && allowed.size > 0 && !allowed.has(requestedModel)) {
         var err = new Error('Model not permitted');
-        err.code = 'model_not_permitted';
+        (err as any).code = 'model_not_permitted';
-        err.model = requestedModel;
+        (err as any).model = requestedModel;
         throw err;
       }
     } catch (e) {
@@ -487,28 +487,28 @@ async function callAI(messages, options) {
       if (activeProvider === 'openrouter' && model !== FALLBACK_MODEL && openrouter) {
         logger.warn('Trying fallback model: ' + FALLBACK_MODEL);
         try {
-          var fallbackResult = await callOpenRouter(messages, FALLBACK_MODEL, temperature, maxTokens);
+          var fallbackResult: any = await callOpenRouter(messages, FALLBACK_MODEL, temperature, maxTokens);
           fallbackResult.fallback = true;
           fallbackResult.duration = Date.now() - startTime;
           logger.info('Fallback success', { model: FALLBACK_MODEL });
           return fallbackResult;
         } catch (err2) {
-          logger.error('Fallback also failed', { error: err2.message });
+          logger.error('Fallback also failed', { error: (err2 as any).message });
-          throw new Error('All models failed: ' + err2.message);
+          throw new Error('All models failed: ' + (err2 as any).message);
         }
       }
 
       if (activeProvider === 'litellm' && model !== FALLBACK_MODEL && litellmClient) {
         logger.warn('Trying fallback model on LiteLLM: ' + FALLBACK_MODEL);
         try {
-          var litellmFallback = await callLiteLLM(messages, FALLBACK_MODEL, temperature, maxTokens);
+          var litellmFallback: any = await callLiteLLM(messages, FALLBACK_MODEL, temperature, maxTokens);
           litellmFallback.fallback = true;
           litellmFallback.duration = Date.now() - startTime;
           logger.info('LiteLLM fallback success', { model: FALLBACK_MODEL });
           return litellmFallback;
         } catch (err3) {
-          logger.error('LiteLLM fallback also failed', { error: err3.message });
+          logger.error('LiteLLM fallback also failed', { error: (err3 as any).message });
-          throw new Error('All models failed: ' + err3.message);
+          throw new Error('All models failed: ' + (err3 as any).message);
         }
       }
     }

src/utils/embeddings.ts

@@ -67,7 +67,7 @@ async function generateEmbeddingLiteLLM(text, model, dimensions) {
       headers['Authorization'] = 'Bearer ' + process.env.LITELLM_API_KEY;
     }
 
-    var payload = {
+    var payload: any = {
       model: model,
       input: text
     };
@@ -113,7 +113,7 @@ async function generateEmbeddingVertexDirect(text, model, dimensions) {
     var modelName = model.replace(/^vertex_ai\//, '');
 
     // For text-embedding-005, we can specify output dimensions
-    var request = {
+    var request: any = {
       instances: [{ content: text }]
     };
 
@@ -181,7 +181,7 @@ async function searchSimilar(queryText, opts) {
   var db = require('../db/database');
 
   // Generate embedding for query
-  var queryEmbedding = await generateEmbedding(queryText);
+  var queryEmbedding = await generateEmbedding(queryText, undefined as any);
 
   // Build WHERE clause for filtering
   var whereClause = 'WHERE c.published = true AND c.embedding IS NOT NULL';
@@ -233,7 +233,7 @@ async function generateContentEmbedding(content) {
     stripHtml(content.body || '').substring(0, 6000)
   ].filter(Boolean).join('\n\n');
 
-  return await generateEmbedding(text);
+  return await generateEmbedding(text, undefined as any);
 }
 
 /**

src/utils/prompts.ts

@@ -47,7 +47,7 @@ For ABNORMAL systems:
 For NOT REVIEWED systems: simply state "Not reviewed" or "Not examined"
 `;
 
-const PROMPTS = {
+const PROMPTS: Record<string, any> = {
 
   // ======================== HPI ========================
   hpiEncounter: `You are an expert pediatric medical scribe.

src/utils/transcribeLocal.ts

@@ -122,17 +122,17 @@ function transcribeWithLocal(audioBuffer, mimeType) {
 /**
  * Build command-line args based on the detected binary
  */
-function buildArgs(binary, audioPath) {
+function buildArgs(binary: string, audioPath: string): any[] {
   if (binary.includes('faster-whisper')) {
     // faster-whisper CLI
-    var args = ['--model', WHISPER_MODEL_SIZE, '--language', WHISPER_LANGUAGE];
+    var args: any[] = ['--model', WHISPER_MODEL_SIZE, '--language', WHISPER_LANGUAGE];
     if (WHISPER_THREADS) args.push('--threads', WHISPER_THREADS);
     args.push(audioPath);
     return args;
   }
 
   // whisper.cpp style
-  var args = ['-f', audioPath, '-l', WHISPER_LANGUAGE, '-t', WHISPER_THREADS, '--no-timestamps'];
+  var args: any[] = ['-f', audioPath, '-l', WHISPER_LANGUAGE, '-t', WHISPER_THREADS, '--no-timestamps'];
   if (WHISPER_MODEL_PATH) {
     args.push('-m', WHISPER_MODEL_PATH);
   } else {