feat: Enhance session processing and metrics

- Updated session processing commands in documentation for clarity.
- Removed transcript content fetching from session processing, allowing on-demand retrieval.
- Improved session metrics calculations and added new metrics for dashboard.
- Refactored processing scheduler to handle sessions in parallel with concurrency limits.
- Added manual trigger API for processing unprocessed sessions with admin checks.
- Implemented scripts for fetching and parsing transcripts, checking transcript content, and testing processing status.
- Updated Prisma schema to enforce default values for processed sessions.
- Added error handling and logging improvements throughout the processing workflow.

lib/csvFetcher.js

@@ -561,15 +561,8 @@ export async function fetchAndStoreSessionsForAllCompanies() {
               ? session.endTime
               : new Date();
 
-          // Fetch transcript content if URL is available
-          let transcriptContent = null;
-          if (session.fullTranscriptUrl) {
-            transcriptContent = await fetchTranscriptContent(
-              session.fullTranscriptUrl,
-              company.csvUsername,
-              company.csvPassword
-            );
-          }
+          // Note: transcriptContent field was removed from schema
+          // Transcript content can be fetched on-demand from fullTranscriptUrl
 
           // Check if the session already exists
           const existingSession = await prisma.session.findUnique({
@@ -608,7 +601,6 @@ export async function fetchAndStoreSessionsForAllCompanies() {
                   ? session.forwardedHr
                   : null,
               fullTranscriptUrl: session.fullTranscriptUrl || null,
-              transcriptContent: transcriptContent, // Add the transcript content
               avgResponseTime:
                 typeof session.avgResponseTime === "number"
                   ? session.avgResponseTime