fix: disposition for answered inbound calls + SLA timing wiring + backfill

Three related fixes:

1. Disposition for answered inbound calls
   Previously the dispose endpoint sent the agent's choice to Ozonetel
   but never wrote it back to the platform Call record. The webhook's
   pre-disposition value ("General Enquiry" → INFO_PROVIDED) persisted.
   Now: dispose endpoint finds the Call by UCID and updates disposition
   to the agent's actual selection.

2. SLA timing wiring (assignedAt / answeredAt / responseTimeS)
   patchCallTiming() existed but was never called. Now wired into
   handleCallEvent:
   - "Calling" event → writes assignedAt (ring start)
   - "Answered" event → writes answeredAt + computes responseTimeS
     (answeredAt - startedAt = caller wait time)
   Uses patchCallTimingByUcid helper that looks up Call by UCID.

3. Backfill maint endpoint: POST /api/maint/backfill-call-disposition-timing
   Walks calls for a given date, joins to CDR by UCID (both legs),
   patches disposition (from CDR's mapped value, always overwrites),
   timing fields (answeredAt, assignedAt, responseTimeS from CDR),
   and CDR-specific durations (handlingTimeS, acwDurationS, holdDurationS).
   Idempotent — safe to run multiple times.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/maint/maint.controller.ts

@@ -972,4 +972,110 @@ export class MaintController {
         this.logger.log(`[MAINT] Appointment clinic backfill complete: scanned=${appointments.length} patched=${patched} skipped=${skipped} reasons=${JSON.stringify(skippedReasons)}`);
         return { status: 'ok', scanned: appointments.length, patched, skipped, skippedReasons };
     }
+
+    // Backfill disposition + SLA timing on historical calls using CDR data.
+    // Walks calls from a given date (IST), joins to CDR by UCID, and patches
+    // disposition (from CDR's mapped value) + timing fields. Idempotent —
+    // only overwrites null fields (disposition is always overwritten since
+    // the webhook default is unreliable).
+    @Post('backfill-call-disposition-timing')
+    async backfillCallDispositionTiming(@Body() body: { date?: string }) {
+        const date = body.date ?? new Date(Date.now() + 5.5 * 60 * 60 * 1000).toISOString().slice(0, 10);
+        this.logger.log(`[MAINT] Backfill disposition+timing for date=${date}`);
+
+        // Fetch CDR for the date
+        const cdrRows = await this.ozonetel.fetchCDR({ date }).catch(() => []);
+        if (cdrRows.length === 0) return { status: 'ok', date, scanned: 0, patched: 0, skipped: 0 };
+
+        // Build UCID + monitorUCID map
+        const byUcid = new Map<string, any>();
+        for (const row of cdrRows) {
+            const ucid = String(row.UCID ?? '').trim();
+            const monUcid = String(row.monitorUCID ?? '').trim();
+            if (ucid) byUcid.set(ucid, row);
+            if (monUcid && monUcid !== ucid) byUcid.set(monUcid, row);
+        }
+
+        // Fetch calls for the date that have a UCID
+        const gte = `${date}T00:00:00+05:30`;
+        const lte = `${date}T23:59:59+05:30`;
+        const callsData = await this.platform.query<any>(
+            `{ calls(first: 500, filter: {
+                startedAt: { gte: "${gte}", lte: "${lte}" },
+                ucid: { is: NOT_NULL }
+            }) { edges { node {
+                id ucid disposition assignedAt answeredAt responseTimeS startedAt
+            } } } }`,
+        ).catch(() => ({ calls: { edges: [] } }));
+
+        const calls = callsData?.calls?.edges?.map((e: any) => e.node) ?? [];
+        let patched = 0;
+        let skipped = 0;
+
+        const dispositionMap: Record<string, string> = {
+            'General Enquiry': 'INFO_PROVIDED',
+            'Appointment Booked': 'APPOINTMENT_BOOKED',
+            'Follow Up': 'FOLLOW_UP_SCHEDULED',
+            'Not Interested': 'NOT_INTERESTED',
+            'Wrong Number': 'WRONG_NUMBER',
+            'No Answer': 'NO_ANSWER',
+        };
+
+        const parseHms = (hms: string | null | undefined): number | null => {
+            if (!hms) return null;
+            const parts = String(hms).split(':').map(Number);
+            if (parts.length !== 3 || parts.some(isNaN)) return null;
+            return parts[0] * 3600 + parts[1] * 60 + parts[2];
+        };
+
+        for (const call of calls) {
+            const cdrRow = byUcid.get(String(call.ucid).trim());
+            if (!cdrRow) { skipped++; continue; }
+
+            const patch: Record<string, any> = {};
+
+            // Disposition — always overwrite (webhook default is unreliable)
+            const cdrDisp = dispositionMap[cdrRow.Disposition] ?? null;
+            if (cdrDisp) patch.disposition = cdrDisp;
+
+            // Timing — only fill if null
+            if (!call.answeredAt && cdrRow.AnswerTime) {
+                patch.answeredAt = new Date(cdrRow.AnswerTime).toISOString();
+            }
+            if (!call.assignedAt && cdrRow.StartTime) {
+                patch.assignedAt = new Date(cdrRow.StartTime).toISOString();
+            }
+            if (!call.responseTimeS && call.startedAt && (patch.answeredAt || call.answeredAt)) {
+                const start = new Date(call.startedAt).getTime();
+                const answered = new Date(patch.answeredAt ?? call.answeredAt).getTime();
+                if (!isNaN(start) && !isNaN(answered)) {
+                    patch.responseTimeS = Math.max(0, Math.round((answered - start) / 1000));
+                }
+            }
+
+            // CDR timing fields
+            const handlingSec = parseHms(cdrRow.HandlingTime);
+            const wrapupSec = parseHms(cdrRow.WrapupDuration);
+            const holdSec = parseHms(cdrRow.HoldDuration);
+            if (handlingSec !== null) patch.handlingTimeS = handlingSec;
+            if (wrapupSec !== null) patch.acwDurationS = wrapupSec;
+            if (holdSec !== null) patch.holdDurationS = holdSec;
+
+            if (Object.keys(patch).length === 0) { skipped++; continue; }
+
+            try {
+                await this.platform.query<any>(
+                    `mutation($id: UUID!, $data: CallUpdateInput!) { updateCall(id: $id, data: $data) { id } }`,
+                    { id: call.id, data: patch },
+                );
+                patched++;
+            } catch (err: any) {
+                this.logger.warn(`[MAINT] Backfill patch failed for ${call.id}: ${err.message}`);
+                skipped++;
+            }
+        }
+
+        this.logger.log(`[MAINT] Disposition+timing backfill complete: date=${date} scanned=${calls.length} patched=${patched} skipped=${skipped}`);
+        return { status: 'ok', date, scanned: calls.length, patched, skipped };
+    }
 }