feat: event bus with Redpanda + AI insight consumer

- EventBusService: Kafka/Redpanda pub/sub with kafkajs, graceful fallback when broker unavailable
- Topics: call.completed, call.missed, agent.state
- AiInsightConsumer: on call.completed, fetches lead activity → OpenAI generates summary + suggested action → updates Lead entity on platform
- Disposition endpoint emits call.completed event after Ozonetel dispose
- EventsModule registered as @Global for cross-module injection
- Redpanda container added to VPS docker-compose
- Docker image rebuilt for linux/amd64 with kafkajs dependency

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

src/app.module.ts

@@ -15,6 +15,7 @@ import { SearchModule } from './search/search.module';
 import { SupervisorModule } from './supervisor/supervisor.module';
 import { MaintModule } from './maint/maint.module';
 import { RecordingsModule } from './recordings/recordings.module';
+import { EventsModule } from './events/events.module';
 
 @Module({
     imports: [
@@ -36,6 +37,7 @@ import { RecordingsModule } from './recordings/recordings.module';
         SupervisorModule,
         MaintModule,
         RecordingsModule,
+        EventsModule,
     ],
 })
 export class AppModule {}

src/events/consumers/ai-insight.consumer.ts

@@ -0,0 +1,119 @@
+import { Injectable, Logger, OnModuleInit } from '@nestjs/common';
+import { ConfigService } from '@nestjs/config';
+import { generateObject } from 'ai';
+import { z } from 'zod';
+import { EventBusService } from '../event-bus.service';
+import { Topics } from '../event-types';
+import type { CallCompletedEvent } from '../event-types';
+import { PlatformGraphqlService } from '../../platform/platform-graphql.service';
+import { createAiModel } from '../../ai/ai-provider';
+import type { LanguageModel } from 'ai';
+
+@Injectable()
+export class AiInsightConsumer implements OnModuleInit {
+    private readonly logger = new Logger(AiInsightConsumer.name);
+    private readonly aiModel: LanguageModel | null;
+
+    constructor(
+        private eventBus: EventBusService,
+        private platform: PlatformGraphqlService,
+        private config: ConfigService,
+    ) {
+        this.aiModel = createAiModel(config);
+    }
+
+    onModuleInit() {
+        this.eventBus.on(Topics.CALL_COMPLETED, (event: CallCompletedEvent) => this.handleCallCompleted(event));
+    }
+
+    private async handleCallCompleted(event: CallCompletedEvent): Promise<void> {
+        if (!event.leadId) {
+            this.logger.debug('[AI-INSIGHT] No leadId — skipping');
+            return;
+        }
+
+        if (!this.aiModel) {
+            this.logger.debug('[AI-INSIGHT] No AI model configured — skipping');
+            return;
+        }
+
+        this.logger.log(`[AI-INSIGHT] Generating insight for lead ${event.leadId}`);
+
+        try {
+            // Fetch lead + all activities
+            const data = await this.platform.query<any>(
+                `{ leads(filter: { id: { eq: "${event.leadId}" } }) { edges { node {
+                    id name contactName { firstName lastName }
+                    status source interestedService
+                    contactAttempts lastContacted
+                } } } }`,
+            );
+            const lead = data?.leads?.edges?.[0]?.node;
+            if (!lead) return;
+
+            const activityData = await this.platform.query<any>(
+                `{ leadActivities(first: 20, filter: { leadId: { eq: "${event.leadId}" } }, orderBy: [{ occurredAt: DescNullsLast }]) {
+                    edges { node { activityType summary occurredAt channel durationSec outcome } }
+                } }`,
+            );
+            const activities = activityData?.leadActivities?.edges?.map((e: any) => e.node) ?? [];
+
+            const leadName = lead.contactName
+                ? `${lead.contactName.firstName ?? ''} ${lead.contactName.lastName ?? ''}`.trim()
+                : lead.name ?? 'Unknown';
+
+            // Build context
+            const activitySummary = activities.map((a: any) =>
+                `${a.activityType}: ${a.summary} (${a.occurredAt ?? 'unknown date'})`,
+            ).join('\n');
+
+            // Generate insight
+            const { object } = await generateObject({
+                model: this.aiModel,
+                schema: z.object({
+                    summary: z.string().describe('2-3 sentence summary of this lead based on all their interactions'),
+                    suggestedAction: z.string().describe('One clear next action for the agent'),
+                }),
+                system: `You are a CRM assistant for Global Hospital Bangalore.
+Generate a brief, actionable insight about this lead based on their interaction history.
+Be specific — reference actual dates, dispositions, and patterns.
+If the lead has booked appointments, mention upcoming ones.
+If they keep calling about the same thing, note the pattern.`,
+                prompt: `Lead: ${leadName}
+Status: ${lead.status ?? 'Unknown'}
+Source: ${lead.source ?? 'Unknown'}
+Interested in: ${lead.interestedService ?? 'Not specified'}
+Contact attempts: ${lead.contactAttempts ?? 0}
+Last contacted: ${lead.lastContacted ?? 'Never'}
+
+Recent activity (newest first):
+${activitySummary || 'No activity recorded'}
+
+Latest call:
+- Direction: ${event.direction}
+- Duration: ${event.durationSec}s
+- Disposition: ${event.disposition}
+- Notes: ${event.notes ?? 'None'}`,
+                maxOutputTokens: 200,
+            });
+
+            // Update lead with new AI insight
+            await this.platform.query<any>(
+                `mutation($id: UUID!, $data: LeadUpdateInput!) { updateLead(id: $id, data: $data) { id } }`,
+                {
+                    id: event.leadId,
+                    data: {
+                        aiSummary: object.summary,
+                        aiSuggestedAction: object.suggestedAction,
+                        lastContacted: new Date().toISOString(),
+                        contactAttempts: (lead.contactAttempts ?? 0) + 1,
+                    },
+                },
+            );
+
+            this.logger.log(`[AI-INSIGHT] Updated lead ${event.leadId}: "${object.summary.substring(0, 60)}..."`);
+        } catch (err: any) {
+            this.logger.error(`[AI-INSIGHT] Failed for lead ${event.leadId}: ${err.message}`);
+        }
+    }
+}

src/events/event-bus.service.ts

@@ -0,0 +1,114 @@
+import { Injectable, Logger, OnModuleInit, OnModuleDestroy } from '@nestjs/common';
+import { Kafka, Producer, Consumer, EachMessagePayload } from 'kafkajs';
+import type { EventPayload } from './event-types';
+
+type EventHandler = (payload: any) => Promise<void>;
+
+@Injectable()
+export class EventBusService implements OnModuleInit, OnModuleDestroy {
+    private readonly logger = new Logger(EventBusService.name);
+    private kafka: Kafka;
+    private producer: Producer;
+    private consumer: Consumer;
+    private handlers = new Map<string, EventHandler[]>();
+    private connected = false;
+
+    constructor() {
+        const brokers = (process.env.KAFKA_BROKERS ?? 'localhost:9092').split(',');
+        this.kafka = new Kafka({
+            clientId: 'helix-engage-sidecar',
+            brokers,
+            retry: { retries: 5, initialRetryTime: 1000 },
+            logLevel: 1, // ERROR only
+        });
+        this.producer = this.kafka.producer();
+        this.consumer = this.kafka.consumer({ groupId: 'helix-engage-workers' });
+    }
+
+    async onModuleInit() {
+        try {
+            await this.producer.connect();
+            await this.consumer.connect();
+            this.connected = true;
+            this.logger.log('Event bus connected (Kafka/Redpanda)');
+
+            // Subscribe to all topics we have handlers for
+            // Handlers are registered by consumer modules during their onModuleInit
+            // We start consuming after a short delay to let all handlers register
+            setTimeout(() => this.startConsuming(), 2000);
+        } catch (err: any) {
+            this.logger.warn(`Event bus not available (${err.message}) — running without events`);
+            this.connected = false;
+        }
+    }
+
+    async onModuleDestroy() {
+        if (this.connected) {
+            await this.consumer.disconnect().catch(() => {});
+            await this.producer.disconnect().catch(() => {});
+        }
+    }
+
+    async emit(topic: string, payload: EventPayload): Promise<void> {
+        if (!this.connected) {
+            this.logger.debug(`[EVENT] Skipped (not connected): ${topic}`);
+            return;
+        }
+
+        try {
+            await this.producer.send({
+                topic,
+                messages: [{ value: JSON.stringify(payload), timestamp: Date.now().toString() }],
+            });
+            this.logger.log(`[EVENT] Emitted: ${topic}`);
+        } catch (err: any) {
+            this.logger.error(`[EVENT] Failed to emit ${topic}: ${err.message}`);
+        }
+    }
+
+    on(topic: string, handler: EventHandler): void {
+        const existing = this.handlers.get(topic) ?? [];
+        existing.push(handler);
+        this.handlers.set(topic, existing);
+        this.logger.log(`[EVENT] Handler registered for: ${topic}`);
+    }
+
+    private async startConsuming(): Promise<void> {
+        if (!this.connected) return;
+
+        const topics = Array.from(this.handlers.keys());
+        if (topics.length === 0) {
+            this.logger.log('[EVENT] No handlers registered — skipping consumer');
+            return;
+        }
+
+        try {
+            for (const topic of topics) {
+                await this.consumer.subscribe({ topic, fromBeginning: false });
+            }
+
+            await this.consumer.run({
+                eachMessage: async (payload: EachMessagePayload) => {
+                    const { topic, message } = payload;
+                    const handlers = this.handlers.get(topic) ?? [];
+                    if (handlers.length === 0 || !message.value) return;
+
+                    try {
+                        const data = JSON.parse(message.value.toString());
+                        for (const handler of handlers) {
+                            await handler(data).catch(err =>
+                                this.logger.error(`[EVENT] Handler error on ${topic}: ${err.message}`),
+                            );
+                        }
+                    } catch (err: any) {
+                        this.logger.error(`[EVENT] Parse error on ${topic}: ${err.message}`);
+                    }
+                },
+            });
+
+            this.logger.log(`[EVENT] Consuming: ${topics.join(', ')}`);
+        } catch (err: any) {
+            this.logger.error(`[EVENT] Consumer failed: ${err.message}`);
+        }
+    }
+}

src/events/event-types.ts

@@ -0,0 +1,36 @@
+// Event topic names
+export const Topics = {
+    CALL_COMPLETED: 'call.completed',
+    CALL_MISSED: 'call.missed',
+    AGENT_STATE: 'agent.state',
+} as const;
+
+// Event payloads
+export type CallCompletedEvent = {
+    callId: string | null;
+    ucid: string;
+    agentId: string;
+    callerPhone: string;
+    direction: string;
+    durationSec: number;
+    disposition: string;
+    leadId: string | null;
+    notes: string | null;
+    timestamp: string;
+};
+
+export type CallMissedEvent = {
+    callId: string | null;
+    callerPhone: string;
+    leadId: string | null;
+    leadName: string | null;
+    timestamp: string;
+};
+
+export type AgentStateEvent = {
+    agentId: string;
+    state: string;
+    timestamp: string;
+};
+
+export type EventPayload = CallCompletedEvent | CallMissedEvent | AgentStateEvent;

src/events/events.module.ts

@@ -0,0 +1,12 @@
+import { Module, Global } from '@nestjs/common';
+import { PlatformModule } from '../platform/platform.module';
+import { EventBusService } from './event-bus.service';
+import { AiInsightConsumer } from './consumers/ai-insight.consumer';
+
+@Global()
+@Module({
+    imports: [PlatformModule],
+    providers: [EventBusService, AiInsightConsumer],
+    exports: [EventBusService],
+})
+export class EventsModule {}

src/ozonetel/ozonetel-agent.controller.ts

@@ -3,6 +3,8 @@ import { ConfigService } from '@nestjs/config';
 import { OzonetelAgentService } from './ozonetel-agent.service';
 import { MissedQueueService } from '../worklist/missed-queue.service';
 import { PlatformGraphqlService } from '../platform/platform-graphql.service';
+import { EventBusService } from '../events/event-bus.service';
+import { Topics } from '../events/event-types';
 
 @Controller('api/ozonetel')
 export class OzonetelAgentController {
@@ -17,6 +19,7 @@ export class OzonetelAgentController {
         private readonly config: ConfigService,
         private readonly missedQueue: MissedQueueService,
         private readonly platform: PlatformGraphqlService,
+        private readonly eventBus: EventBusService,
     ) {
         this.defaultAgentId = config.get<string>('OZONETEL_AGENT_ID') ?? 'agent3';
         this.defaultAgentPassword = config.get<string>('OZONETEL_AGENT_PASSWORD') ?? '';
@@ -161,6 +164,20 @@ export class OzonetelAgentController {
             this.logger.warn(`Auto-assignment after dispose failed: ${err}`);
         }
 
+        // Emit event for downstream processing (AI insights, metrics, etc.)
+        this.eventBus.emit(Topics.CALL_COMPLETED, {
+            callId: null,
+            ucid: body.ucid,
+            agentId: this.defaultAgentId,
+            callerPhone: body.callerPhone ?? '',
+            direction: body.direction ?? 'INBOUND',
+            durationSec: body.durationSec ?? 0,
+            disposition: body.disposition,
+            leadId: body.leadId ?? null,
+            notes: body.notes ?? null,
+            timestamp: new Date().toISOString(),
+        }).catch(() => {});
+
         return { status: 'ok' };
     }