Your safe space for
mental wellness

┌─────────────────────────────────────────────────────────────────┐ │ CLIENT (Browser) │ │ ┌──────────┐ ┌──────────┐ ┌──────────┐ ┌──────────┐ │ │ │ Landing │ │ Survey │ │ Chat │ │ Doctors │ Settings │ │ │ Page │ │ PHQ/GAD │ │ UI │ │ Connect │ Page │ │ └────┬─────┘ └────┬─────┘ └────┬─────┘ └────┬─────┘ │ │ └─────────────┴────────────┴─────────────┘ │ │ │ React / Next.js │ │ │ TLS 1.3 Encrypted │ └──────────────────────────┼──────────────────────────────────────┘ │ REST API + WebSocket ┌──────────────────────────┼──────────────────────────────────────┐ │ API GATEWAY (nginx) │ │ Rate Limiting · CORS · Auth │ └──────────────────────────┼──────────────────────────────────────┘ │ ┌──────────────────────────┼──────────────────────────────────────┐ │ APPLICATION SERVER │ │ Node.js / FastAPI + Guardrails │ │ ┌──────────────┐ ┌──────────────┐ ┌──────────────┐ │ │ │ Assessment │ │ Chat Engine │ │ Escalation │ │ │ │ Service │ │ + LLM API │ │ Service │ │ │ └──────┬───────┘ └──────┬───────┘ └──────┬───────┘ │ │ ┌──────┴───────┐ ┌──────┴───────┐ ┌──────┴───────┐ │ │ │ Booking │ │ Privacy │ │ Notification │ │ │ │ Service │ │ Service │ │ Service │ │ │ └──────────────┘ └──────────────┘ └──────────────┘ │ └──────────────────────────┼──────────────────────────────────────┘ │ ┌──────────────────────────┼──────────────────────────────────────┐ │ DATA LAYER │ │ ┌──────────────┐ ┌──────────────┐ ┌──────────────┐ │ │ │ PostgreSQL │ │ Redis │ │ Object Store│ │ │ │ (Primary DB) │ │ (Sessions) │ │ (Exports) │ │ │ │ AES-256 Enc │ │ Ephemeral │ │ Encrypted │ │ │ └──────────────┘ └──────────────┘ └──────────────┘ │ └─────────────────────────────────────────────────────────────────┘

-- Users table CREATE TABLE users ( id UUID PRIMARY KEY DEFAULT gen_random_uuid(), anonymous_id VARCHAR(64) UNIQUE NOT NULL, email VARCHAR(255) ENCRYPTED, -- optional created_at TIMESTAMPTZ DEFAULT NOW(), last_active TIMESTAMPTZ, preferences JSONB DEFAULT '{}', data_consent BOOLEAN DEFAULT false, is_deleted BOOLEAN DEFAULT false -- soft delete ); -- Assessments CREATE TABLE assessments ( id UUID PRIMARY KEY DEFAULT gen_random_uuid(), user_id UUID REFERENCES users(id) ON DELETE CASCADE, type VARCHAR(20) NOT NULL, -- 'PHQ9' | 'GAD7' answers JSONB NOT NULL ENCRYPTED, total_score INTEGER NOT NULL, risk_level VARCHAR(20) NOT NULL, -- minimal|mild|moderate|mod_severe|severe created_at TIMESTAMPTZ DEFAULT NOW() ); -- Chat Sessions CREATE TABLE chat_sessions ( id UUID PRIMARY KEY DEFAULT gen_random_uuid(), user_id UUID REFERENCES users(id) ON DELETE CASCADE, started_at TIMESTAMPTZ DEFAULT NOW(), ended_at TIMESTAMPTZ, crisis_flagged BOOLEAN DEFAULT false, summary TEXT ENCRYPTED ); -- Messages CREATE TABLE messages ( id UUID PRIMARY KEY DEFAULT gen_random_uuid(), session_id UUID REFERENCES chat_sessions(id) ON DELETE CASCADE, role VARCHAR(10) NOT NULL, -- 'user' | 'assistant' content TEXT NOT NULL ENCRYPTED, created_at TIMESTAMPTZ DEFAULT NOW(), flagged BOOLEAN DEFAULT false -- crisis keyword detected ); -- Professionals CREATE TABLE professionals ( id UUID PRIMARY KEY DEFAULT gen_random_uuid(), name VARCHAR(255) NOT NULL, title VARCHAR(255), specialties TEXT[], rating DECIMAL(2,1), review_count INTEGER DEFAULT 0, available BOOLEAN DEFAULT true, bio TEXT, avatar_url VARCHAR(512) ); -- Consultations CREATE TABLE consultations ( id UUID PRIMARY KEY DEFAULT gen_random_uuid(), user_id UUID REFERENCES users(id) ON DELETE CASCADE, professional_id UUID REFERENCES professionals(id), preferred_date DATE, preferred_time TIME, reason VARCHAR(255), consent_shared BOOLEAN DEFAULT false, status VARCHAR(20) DEFAULT 'pending', -- pending|confirmed|completed|cancelled assessment_snapshot JSONB ENCRYPTED, created_at TIMESTAMPTZ DEFAULT NOW() ); -- Crisis Events (audit log) CREATE TABLE crisis_events ( id UUID PRIMARY KEY DEFAULT gen_random_uuid(), user_id UUID REFERENCES users(id) ON DELETE SET NULL, session_id UUID REFERENCES chat_sessions(id), trigger_content TEXT ENCRYPTED, action_taken VARCHAR(50), -- 'banner_shown'|'chat_disabled'|'hotline_displayed' created_at TIMESTAMPTZ DEFAULT NOW() ); -- Indexes CREATE INDEX idx_assessments_user ON assessments(user_id, created_at DESC); CREATE INDEX idx_messages_session ON messages(session_id, created_at); CREATE INDEX idx_consultations_user ON consultations(user_id, status); CREATE INDEX idx_crisis_events_user ON crisis_events(user_id, created_at DESC);

AI Safety Middleware Pipeline: 1. INPUT FILTER ├─ Crisis keyword detection (regex + NLP classifier) ├─ PII detection and redaction └─ Content length / rate limiting 2. SYSTEM PROMPT ENFORCEMENT ├─ "You are NOT a doctor or therapist" ├─ "Never diagnose conditions" ├─ "Never prescribe medication or treatment" ├─ "Always encourage professional help for serious concerns" └─ "If crisis detected, respond with safety resources ONLY" 3. OUTPUT FILTER ├─ Scan for accidental diagnostic language ├─ Ensure disclaimer presence in first message ├─ Block medical advice patterns └─ Inject crisis resources when flagged 4. ESCALATION TRIGGER ├─ Keywords: suicide, self-harm, end my life, kill myself, etc. ├─ Action: Log crisis_event → Show banner → Disable AI chat └─ Notify on-call staff (if available)