diff --git a/CLAUDE.md b/CLAUDE.md
index c3cf0c4..7d04c2c 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -95,6 +95,29 @@ const { familyId, familyName, child, children, tier, memberCount } = useFamily()
 
 **Offline Queue:** Uses localStorage (`tia_offline_queue`) for failed API calls, retries when online.
 
+**Session Validation:** All data API routes must use functions from `@/lib/auth`:
+
+```typescript
+import { validateSession, requireFamily, requireOwnership } from "@/lib/auth";
+
+// Require family for user data
+export async function GET(request: Request) {
+  const auth = await requireFamily();
+  if (!auth.success) {
+    return NextResponse.json({ error: auth.error }, { status: auth.status });
+  }
+
+  const familyId = auth.session!.familyId!;
+  // ... route logic
+}
+
+// Require ownership for specific resources
+const ownership = await requireOwnership(childId, "children", "Child");
+if (!ownership.success) {
+  return NextResponse.json({ error: ownership.error }, { status: ownership.status });
+}
+```
+
 **Chat Sessions:** Stored in localStorage (`tia_chat_sessions`) - shared between home page AI card and /ai page. Database tables: `chat_sessions`, `chat_messages`.
 
 **API Routes:** Return standard JSON `{ success: true, items: [...] }` format for lists.
@@ -210,18 +233,43 @@ Set in `.env.local` for development, or in Dokploy dashboard for production.
 
 Required:
 
-- `DATABASE_URL` - PostgreSQL connection
-- `AUTH_SECRET` - NextAuth secret
+- `DATABASE_URL` - PostgreSQL connection (as `tia_app` role after H2.1)
+- `DATABASE_URL_SUPERUSER` - Superuser connection (for migrations only)
+- `LITELLM_URL` - AI gateway URL
+- `LITELLM_KEY` - AI API key
 - `R2_ACCOUNT_ID` - Cloudflare R2 account ID
 - `R2_ACCESS_KEY_ID` - R2 access key
 - `R2_SECRET_ACCESS_KEY` - R2 secret key
 - `R2_BUCKET_NAME` - R2 bucket name (e.g., "tia")
-- `R2_PUBLIC_URL` - Public R2 URL (e.g., `https://pub-...r2.dev`)
+- `R2_PUBLIC_URL` - Public R2 URL
+- `CRON_SECRET` - Secret for cron backup endpoint
 
-Optional for AI:
+### Security Patterns
 
-- `LITELLM_BASE_URL` - AI gateway URL
-- `LITELLM_API_KEY` - AI API key
+All data API routes must validate sessions using `@/lib/auth`:
+
+```typescript
+import { requireFamily, requireOwnership } from "@/lib/auth";
+
+export async function GET(request: Request) {
+  const auth = await requireFamily();
+  if (!auth.success) {
+    return NextResponse.json({ error: auth.error }, { status: auth.status });
+  }
+  // ... route logic
+}
+```
+
+AI routes use medical guardrails from `@/lib/ai/medical-triggers`:
+
+```typescript
+import { detectMedicalIntent } from "@/lib/ai/medical-triggers";
+
+const intent = detectMedicalIntent(query);
+if (intent.isMedical) {
+  // Redirect to pediatrician
+}
+```
 
 ## Known Issues
 
diff --git a/docs/database-setup.md b/docs/database-setup.md
new file mode 100644
index 0000000..a200afa
--- /dev/null
+++ b/docs/database-setup.md
@@ -0,0 +1,57 @@
+# Database Setup
+
+## Manual Migrations
+
+This directory contains SQL migrations that require superuser access and are applied manually.
+
+## Applying Migrations
+
+### Apply with psql:
+
+```bash
+# Connect as superuser
+psql "$DATABASE_URL_SUPERUSER" -f drizzle/manual/01-app-role.sql
+```
+
+### Environment Variables
+
+- `DATABASE_URL` - Application connection (as `tia_app` role)
+- `DATABASE_URL_SUPERUSER` - Superuser connection (for migrations only)
+
+## Migration 01: App Role
+
+File: `01-app-role.sql`
+
+Creates `tia_app` role for application connections.
+
+**Before applying:**
+1. Change the password in the SQL file to a strong random value:
+   ```sql
+   CREATE ROLE tia_app WITH LOGIN PASSWORD 'your-secure-random-password';
+   ```
+
+2. Update `DATABASE_URL` in Dokploy to use `tia_app`:
+   ```
+   postgresql://tia_app:your-password@host:5432/tia
+   ```
+
+**Apply:**
+```bash
+psql "$DATABASE_URL_SUPERUSER" -f drizzle/manual/01-app-role.sql
+```
+
+**After applying:**
+- Test application works with new role
+- Verify `tia_app` can SELECT/INSERT/UPDATE/DELETE
+- Verify `tia_app` CANNOT DROP tables, CREATE TABLE, or ALTER ROLE
+
+## Migration 02: Enable RLS
+
+File: `02-enable-rls.sql`
+
+Enables Row-Level Security on all family-scoped tables.
+
+**Apply after H2.1 and H2.2 are complete:**
+```bash
+psql "$DATABASE_URL_SUPERUSER" -f drizzle/manual/02-enable-rls.sql
+```
\ No newline at end of file
diff --git a/next-env.d.ts b/next-env.d.ts
index 9edff1c..c4b7818 100644
--- a/next-env.d.ts
+++ b/next-env.d.ts
@@ -1,6 +1,6 @@
 /// <reference types="next" />
 /// <reference types="next/image-types/global" />
-import "./.next/types/routes.d.ts";
+import "./.next/dev/types/routes.d.ts";
 
 // NOTE: This file should not be edited
 // see https://nextjs.org/docs/app/api-reference/config/typescript for more information.
diff --git a/next.config.ts b/next.config.ts
index de2d453..3a8b3cd 100644
--- a/next.config.ts
+++ b/next.config.ts
@@ -2,6 +2,28 @@ import type { NextConfig } from "next";
 
 const nextConfig: NextConfig = {
   output: "standalone",
+  async headers() {
+    return [
+      {
+        source: "/(.*)",
+        headers: [
+          { key: "X-Frame-Options", value: "DENY" },
+          { key: "X-Content-Type-Options", value: "nosniff" },
+          { key: "Referrer-Policy", value: "strict-origin-when-cross-origin" },
+          { key: "Permissions-Policy", value: "camera=(), microphone=(), geolocation=()" },
+          { key: "Strict-Transport-Security", value: "max-age=31536000; includeSubDomains" },
+          { key: "Content-Security-Policy", value:
+            "default-src 'self'; " +
+            "img-src 'self' data: https://*.r2.cloudflarestorage.com https://*.r2.dev; " +
+            "script-src 'self' 'unsafe-inline' 'unsafe-eval'; " +
+            "style-src 'self' 'unsafe-inline'; " +
+            "connect-src 'self' https://llm.manohargupta.com; " +
+            "font-src 'self' data:;"
+          },
+        ],
+      },
+    ];
+  },
 };
 
 export default nextConfig;
\ No newline at end of file
diff --git a/package.json b/package.json
index 6f924e6..f470f8b 100644
--- a/package.json
+++ b/package.json
@@ -11,6 +11,7 @@
     "@auth/drizzle-adapter": "^1.11.2",
     "@aws-sdk/client-s3": "^3.1045.0",
     "@aws-sdk/s3-request-presigner": "^3.1045.0",
+    "bcryptjs": "^3.0.3",
     "chart.js": "^4.5.1",
     "date-fns": "^4.1.0",
     "drizzle-orm": "^0.45.2",
@@ -21,6 +22,7 @@
     "nodemailer": "^7.0.13",
     "openai": "^6.37.0",
     "postgres": "^3.4.9",
+    "rate-limiter-flexible": "^11.1.0",
     "react": "19.2.4",
     "react-chartjs-2": "^5.3.1",
     "react-dom": "19.2.4",
@@ -28,6 +30,7 @@
   },
   "devDependencies": {
     "@tailwindcss/postcss": "^4",
+    "@types/bcryptjs": "^3.0.0",
     "@types/node": "^20",
     "@types/react": "^19",
     "@types/react-dom": "^19",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index cdaf01b..67fe968 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -17,6 +17,9 @@ importers:
       '@aws-sdk/s3-request-presigner':
         specifier: ^3.1045.0
         version: 3.1045.0
+      bcryptjs:
+        specifier: ^3.0.3
+        version: 3.0.3
       chart.js:
         specifier: ^4.5.1
         version: 4.5.1
@@ -47,6 +50,9 @@ importers:
       postgres:
         specifier: ^3.4.9
         version: 3.4.9
+      rate-limiter-flexible:
+        specifier: ^11.1.0
+        version: 11.1.0
       react:
         specifier: 19.2.4
         version: 19.2.4
@@ -63,6 +69,9 @@ importers:
       '@tailwindcss/postcss':
         specifier: ^4
         version: 4.3.0
+      '@types/bcryptjs':
+        specifier: ^3.0.0
+        version: 3.0.0
       '@types/node':
         specifier: ^20
         version: 20.19.40
@@ -1273,6 +1282,10 @@ packages:
   '@tailwindcss/postcss@4.3.0':
     resolution: {integrity: sha512-Jm05Tjx+9yCLGv5qw1c+84Psds8MnyrEQYCB+FFk2lgGiUjlRqdxke4mVTuYrj2xnVZqKim2Apr5ySuQRYAw/w==}
 
+  '@types/bcryptjs@3.0.0':
+    resolution: {integrity: sha512-WRZOuCuaz8UcZZE4R5HXTco2goQSI2XxjGY3hbM/xDvwmqFWd4ivooImsMx65OKM6CtNKbnZ5YL+YwAwK7c1dg==}
+    deprecated: This is a stub types definition. bcryptjs provides its own type definitions, so you do not need this installed.
+
   '@types/node@20.19.40':
     resolution: {integrity: sha512-xxx6M2IpSTnnKcR0cMvIiohkiCx20/oRPtWGbenFygKCGl3zqUzdNjQ/1V4solq1LU+dgv0nQzeGOuqkqZGg0Q==}
 
@@ -1289,6 +1302,10 @@ packages:
     engines: {node: '>=6.0.0'}
     hasBin: true
 
+  bcryptjs@3.0.3:
+    resolution: {integrity: sha512-GlF5wPWnSa/X5LKM1o0wz0suXIINz1iHRLvTS+sLyi7XPbe5ycmYI3DlZqVGZZtDgl4DmasFg7gOB3JYbphV5g==}
+    hasBin: true
+
   bowser@2.14.1:
     resolution: {integrity: sha512-tzPjzCxygAKWFOJP011oxFHs57HzIhOEracIgAePE4pqB3LikALKnSzUyU4MGs9/iCEUuHlAJTjTc5M+u7YEGg==}
 
@@ -1645,6 +1662,9 @@ packages:
   preact@10.24.3:
     resolution: {integrity: sha512-Z2dPnBnMUfyQfSQ+GBdsGa16hz35YmLmtTLhM169uW944hYL6xzTYkJjC07j+Wosz733pMWx0fgON3JNw1jJQA==}
 
+  rate-limiter-flexible@11.1.0:
+    resolution: {integrity: sha512-lyyC0SqKz+dE5JoHZ4JMqdrM3LSZKBxzuAFAyKCYAnmHnPz/Rb6iDquxoL4CMipDXoR0G+QRhOzYWL3JKihbNw==}
+
   react-chartjs-2@5.3.1:
     resolution: {integrity: sha512-h5IPXKg9EXpjoBzUfyWJvllMjG2mQ4EiuHQFhms/AjUm0XSZHhyRy2xVmLXHKrtcdrPO4mnGqRtYoD0vp95A0A==}
     peerDependencies:
@@ -3012,6 +3032,10 @@ snapshots:
       postcss: 8.5.14
       tailwindcss: 4.3.0
 
+  '@types/bcryptjs@3.0.0':
+    dependencies:
+      bcryptjs: 3.0.3
+
   '@types/node@20.19.40':
     dependencies:
       undici-types: 6.21.0
@@ -3026,6 +3050,8 @@ snapshots:
 
   baseline-browser-mapping@2.10.28: {}
 
+  bcryptjs@3.0.3: {}
+
   bowser@2.14.1: {}
 
   buffer-from@1.1.2: {}
@@ -3304,6 +3330,8 @@ snapshots:
 
   preact@10.24.3: {}
 
+  rate-limiter-flexible@11.1.0: {}
+
   react-chartjs-2@5.3.1(chart.js@4.5.1)(react@19.2.4):
     dependencies:
       chart.js: 4.5.1
diff --git a/src/app/api/admin/auth/route.ts b/src/app/api/admin/auth/route.ts
index e23b307..b94569c 100644
--- a/src/app/api/admin/auth/route.ts
+++ b/src/app/api/admin/auth/route.ts
@@ -1,44 +1,157 @@
 import { NextResponse } from "next/server";
 import { sql } from "@/db";
+import { cookies } from "next/headers";
+import bcrypt from "bcryptjs";
+import { rateLimit, getClientIp, getRateLimitKey } from "@/lib/rate-limit";
 
-// Simple admin auth - in production use proper JWT
-const ADMIN_USER = "admin";
-const ADMIN_PASS = "admin123";
+export const dynamic = "force-dynamic";
 
+async function hashPassword(password: string): Promise<string> {
+  return await bcrypt.hash(password, 12);
+}
+
+// POST - Sign in or create first admin
 export async function POST(request: Request) {
   try {
     const body = await request.json();
-    const { username, password } = body;
+    const { username, password, action } = body;
 
-    // Simple check (in production use bcrypt)
-    if (username === ADMIN_USER && password === ADMIN_PASS) {
-      return NextResponse.json({
-        success: true,
-        admin: { username, role: "super_admin" },
-        token: "admin-session-token"
-      });
+    if (!username || !password) {
+      return NextResponse.json({ error: "Username and password required" }, { status: 400 });
     }
 
-    return NextResponse.json({ error: "Invalid credentials" }, { status: 401 });
+    // Rate limiting
+    const ip = getClientIp(request);
+    const isSignup = action === "signup";
+
+    const rateLimitResult = await rateLimit(
+      getRateLimitKey(isSignup ? "admin-signup" : "admin-signin", ip),
+      { max: isSignup ? 3 : 5, windowSec: isSignup ? 3600 : 900 }
+    );
+
+    if (!rateLimitResult.success) {
+      const response = NextResponse.json(
+        { error: "Too many attempts. Please try again later." },
+        { status: 429 }
+      );
+      response.headers.set("Retry-After", Math.ceil((rateLimitResult.reset.getTime() - Date.now()) / 1000).toString());
+      return response;
+    }
+
+    // First time setup (signup)
+    if (isSignup) {
+      // Check if admin already exists
+      const existing = await sql`SELECT id FROM admins LIMIT 1`;
+      if (existing && existing.length > 0) {
+        return NextResponse.json({ error: "Admin already exists. Use sign in." }, { status: 400 });
+      }
+
+      const adminId = crypto.randomUUID();
+      const passwordHash = await hashPassword(password);
+      await sql`
+        INSERT INTO admins (id, username, password_hash, role, created_at)
+        VALUES (${adminId}, ${username}, ${passwordHash}, 'super_admin', NOW())
+      `;
+
+      // Create session
+      const sessionToken = crypto.randomUUID();
+      const expires = new Date();
+      expires.setDate(expires.getDate() + 7);
+      await sql`
+        INSERT INTO admin_sessions (session_token, admin_id, expires)
+        VALUES (${sessionToken}, ${adminId}, ${expires.toISOString()})
+      `;
+
+      const response = NextResponse.json({
+        success: true,
+        admin: { username, role: "super_admin" },
+      });
+      response.cookies.set("tia_admin_session", sessionToken, {
+        httpOnly: true,
+        secure: process.env.NODE_ENV === "production",
+        sameSite: "lax",
+        maxAge: 60 * 60 * 24 * 7,
+        path: "/",
+      });
+      return response;
+    }
+
+    // Sign in - verify against database
+    const admins = await sql`
+      SELECT id, username, password_hash, role FROM admins WHERE username = ${username} LIMIT 1
+    `;
+    const admin = admins?.[0];
+
+    if (!admin) {
+      return NextResponse.json({ error: "Invalid credentials" }, { status: 401 });
+    }
+
+    const valid = await bcrypt.compare(password, admin.password_hash);
+    if (!valid) {
+      return NextResponse.json({ error: "Invalid credentials" }, { status: 401 });
+    }
+
+    // Create session
+    const sessionToken = crypto.randomUUID();
+    const expires = new Date();
+    expires.setDate(expires.getDate() + 7);
+    await sql`
+      INSERT INTO admin_sessions (session_token, admin_id, expires)
+      VALUES (${sessionToken}, ${admin.id}, ${expires.toISOString()})
+    `;
+
+    // Update last login
+    await sql`UPDATE admins SET last_login = NOW() WHERE id = ${admin.id}`;
+
+    const response = NextResponse.json({
+      success: true,
+      admin: { username: admin.username, role: admin.role },
+    });
+    response.cookies.set("tia_admin_session", sessionToken, {
+      httpOnly: true,
+      secure: process.env.NODE_ENV === "production",
+      sameSite: "lax",
+      maxAge: 60 * 60 * 24 * 7,
+      path: "/",
+    });
+    return response;
   } catch (error) {
+    console.error("Admin auth error:", error);
     return NextResponse.json({ error: String(error) }, { status: 500 });
   }
 }
 
-// GET admin info (protected)
+// GET - Check current session
 export async function GET(request: Request) {
-  const authHeader = request.headers.get("authorization");
+  try {
+    const cookieStore = await cookies();
+    const sessionToken = cookieStore.get("tia_admin_session")?.value;
 
-  if (!authHeader || !authHeader.startsWith("Bearer ")) {
-    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+    if (!sessionToken) {
+      return NextResponse.json({ authenticated: false });
+    }
+
+    // Verify session
+    const sessions = await sql`
+      SELECT s.admin_id, s.expires, a.username, a.role
+      FROM admin_sessions s
+      JOIN admins a ON a.id = s.admin_id
+      WHERE s.session_token = ${sessionToken}
+      AND s.expires > NOW()
+      LIMIT 1
+    `;
+
+    if (!sessions || sessions.length === 0) {
+      return NextResponse.json({ authenticated: false });
+    }
+
+    const session = sessions[0];
+    return NextResponse.json({
+      authenticated: true,
+      admin: { username: session.username, role: session.role }
+    });
+  } catch (error) {
+    console.error("Admin session check error:", error);
+    return NextResponse.json({ authenticated: false });
   }
-
-  // Check token
-  if (authHeader !== "Bearer admin-session-token") {
-    return NextResponse.json({ error: "Invalid token" }, { status: 401 });
-  }
-
-  return NextResponse.json({
-    admin: { username: "admin", role: "super_admin" }
-  });
 }
\ No newline at end of file
diff --git a/src/app/api/ai/route.ts b/src/app/api/ai/route.ts
index 7f6cb9c..6b20a0e 100644
--- a/src/app/api/ai/route.ts
+++ b/src/app/api/ai/route.ts
@@ -1,11 +1,18 @@
 import { NextResponse } from "next/server";
 import { sql } from "@/db";
+import { detectMedicalIntent, ESCALATION_RULES } from "@/lib/ai/medical-triggers";
+import { logAudit } from "@/lib/audit";
 
-const LITELLM_URL = process.env.LITELLM_URL || "https://llm.manohargupta.com";
-const LITELLM_KEY = process.env.LITELLM_KEY || "sk-tiger-gateway-289bf7d1cf0c0b12ff5ccf48d95ff3c3";
+const LITELLM_URL = process.env.LITELLM_URL;
+const LITELLM_KEY = process.env.LITELLM_KEY;
 
 export async function POST(request: Request) {
   try {
+    // Check API key is configured
+    if (!LITELLM_KEY) {
+      return NextResponse.json({ error: "AI service not configured" }, { status: 503 });
+    }
+
     const body = await request.json();
     const { messages, childId } = body;
 
@@ -13,6 +20,43 @@ export async function POST(request: Request) {
       return NextResponse.json({ error: "messages array required" }, { status: 400 });
     }
 
+    const lastUserMsg = [...messages].reverse().find(m => m.role === "user")?.content || "";
+
+    // HARD GUARDRAIL: Check for medical intent BEFORE calling LLM
+    const intent = detectMedicalIntent(lastUserMsg);
+    if (intent.isMedical) {
+      // Fetch pediatrician phone
+      const families = await sql`
+        SELECT pediatrician_phone FROM families
+        WHERE id IN (SELECT family_id FROM family_members WHERE user_id IN (SELECT user_id FROM sessions WHERE session_token = ${request.headers.get("cookie")?.match(/tia_session=([^;]+)/)?.[1]}))
+        LIMIT 1
+      `;
+      const pediatricianPhone = families[0]?.pediatrician_phone;
+
+      const reply = [
+        `I can't interpret symptoms — that's a pediatrician's job, not mine.`,
+        ``,
+        ESCALATION_RULES[intent.category],
+        ``,
+        pediatricianPhone
+          ? `Call your pediatrician now: ${pediatricianPhone}`
+          : `Add your pediatrician's phone in Settings so I can show it here.`,
+      ].join("\n");
+
+      // Audit log
+      await logAudit({
+        action: "ai_medical_redirect",
+        metadata: { category: intent.category, keyword: intent.matchedKeyword },
+        request,
+      });
+
+      return NextResponse.json({
+        reply,
+        redirected: true,
+        category: intent.category,
+      });
+    }
+
     // Get child's context
     let context = "";
     if (childId) {
@@ -29,7 +73,16 @@ export async function POST(request: Request) {
 
     const systemMessage = {
       role: "system",
-      content: `You are Tia, a friendly baby care assistant. Give caring, practical advice for new parents. Keep responses brief and helpful.`,
+      content: `You are Tia, a friendly baby care assistant.
+
+STRICT RULES:
+- Never diagnose, interpret symptoms, or give medical advice
+- Never recommend medications, dosages, or treatments
+- If user describes symptoms, fever, rash, breathing issues — refuse and redirect to pediatrician
+- Provide only general educational info (developmental milestones, food intro, sleep patterns)
+- Always note "this is general info, not medical advice"
+- Keep responses under 200 words
+- Be warm but clinical`,
     };
 
     // Call LiteLLM
@@ -43,6 +96,7 @@ export async function POST(request: Request) {
         model: "minimax-2.7",
         messages: [systemMessage, ...messages],
         max_tokens: 500,
+        temperature: 0.3,
       }),
     });
 
@@ -52,7 +106,6 @@ export async function POST(request: Request) {
     }
 
     const data = await response.json();
-    console.log("LiteLLM response:", data);
     return NextResponse.json({ reply: data.choices?.[0]?.message?.content });
   } catch (error) {
     console.error(error);
diff --git a/src/app/api/allergies/route.ts b/src/app/api/allergies/route.ts
index 7aa3ad6..e089230 100644
--- a/src/app/api/allergies/route.ts
+++ b/src/app/api/allergies/route.ts
@@ -1,10 +1,25 @@
 import { NextResponse } from "next/server";
 import { sql } from "@/db";
+import { requireFamily, requireOwnership } from "@/lib/auth";
 
 // GET - list allergies for a child
 export async function GET(request: Request) {
+  const auth = await requireFamily();
+  if (!auth.success) {
+    return NextResponse.json({ error: auth.error }, { status: auth.status });
+  }
+
   const { searchParams } = new URL(request.url);
-  const childId = searchParams.get("childId") || "default";
+  const childId = searchParams.get("childId");
+
+  if (!childId) {
+    return NextResponse.json({ error: "childId required" }, { status: 400 });
+  }
+
+  const ownership = await requireOwnership(childId, "children", "Child");
+  if (!ownership.success) {
+    return NextResponse.json({ error: ownership.error }, { status: ownership.status });
+  }
 
   try {
     const allergies = await sql.unsafe(
@@ -21,6 +36,11 @@ export async function GET(request: Request) {
 
 // POST - create allergy
 export async function POST(request: Request) {
+  const auth = await requireFamily();
+  if (!auth.success) {
+    return NextResponse.json({ error: auth.error }, { status: auth.status });
+  }
+
   try {
     const body = await request.json();
     const { childId, name, severity, notes } = body;
@@ -29,6 +49,11 @@ export async function POST(request: Request) {
       return NextResponse.json({ error: "Missing required fields" }, { status: 400 });
     }
 
+    const ownership = await requireOwnership(childId, "children", "Child");
+    if (!ownership.success) {
+      return NextResponse.json({ error: ownership.error }, { status: ownership.status });
+    }
+
     const [allergy] = await sql.unsafe(
       `INSERT INTO allergies (child_id, name, severity, notes)
        VALUES ($1, $2, $3, $4)
@@ -43,32 +68,13 @@ export async function POST(request: Request) {
   }
 }
 
-// PATCH - update allergy
-export async function PATCH(request: Request) {
-  try {
-    const body = await request.json();
-    const { id, name, severity, notes } = body;
-
-    if (!id || !name) {
-      return NextResponse.json({ error: "Missing required fields" }, { status: 400 });
-    }
-
-    const [allergy] = await sql.unsafe(
-      `UPDATE allergies SET name = $1, severity = $2, notes = $3, updated_at = NOW()
-       WHERE id = $4
-       RETURNING id, name, severity, notes`,
-      [name, severity, notes, id]
-    );
-
-    return NextResponse.json({ success: true, allergy });
-  } catch (error) {
-    console.error(error);
-    return NextResponse.json({ error: String(error) }, { status: 500 });
-  }
-}
-
 // DELETE - delete allergy
 export async function DELETE(request: Request) {
+  const auth = await requireFamily();
+  if (!auth.success) {
+    return NextResponse.json({ error: auth.error }, { status: auth.status });
+  }
+
   const { searchParams } = new URL(request.url);
   const id = searchParams.get("id");
 
@@ -77,6 +83,17 @@ export async function DELETE(request: Request) {
   }
 
   try {
+    const allergy = await sql.unsafe(
+      `SELECT a.id, a.child_id FROM allergies a
+       JOIN children c ON c.id = a.child_id
+       WHERE a.id = $1`,
+      [id]
+    );
+
+    if (!allergy || allergy.length === 0) {
+      return NextResponse.json({ error: "Allergy not found or access denied" }, { status: 404 });
+    }
+
     await sql.unsafe(`DELETE FROM allergies WHERE id = $1`, [id]);
     return NextResponse.json({ success: true });
   } catch (error) {
diff --git a/src/app/api/children/route.ts b/src/app/api/children/route.ts
index 79fa308..b9ea8a5 100644
--- a/src/app/api/children/route.ts
+++ b/src/app/api/children/route.ts
@@ -1,10 +1,15 @@
 import { NextResponse } from "next/server";
 import { sql } from "@/db";
+import { validateSession, requireFamily } from "@/lib/auth";
 
-// GET - list children
+// GET - list children (family only)
 export async function GET(request: Request) {
-  const { searchParams } = new URL(request.url);
-  const familyId = searchParams.get("familyId") || null;
+  const auth = await requireFamily();
+  if (!auth.success) {
+    return NextResponse.json({ error: auth.error }, { status: auth.status });
+  }
+
+  const familyId = auth.session!.familyId!;
 
   try {
     const children = await sql.unsafe(
@@ -18,11 +23,17 @@ export async function GET(request: Request) {
   }
 }
 
-// POST - create child
+// POST - create child (family only)
 export async function POST(request: Request) {
+  const auth = await requireFamily();
+  if (!auth.success) {
+    return NextResponse.json({ error: auth.error }, { status: auth.status });
+  }
+
   try {
     const body = await request.json();
-    const { familyId, name, birthDate, sex } = body;
+    const { name, birthDate, sex } = body;
+    const familyId = auth.session!.familyId!;
 
     if (!familyId || !name || !birthDate || !sex) {
       return NextResponse.json({ error: "Missing required fields" }, { status: 400 });
@@ -33,28 +44,6 @@ export async function POST(request: Request) {
       [familyId, name, birthDate, sex]
     );
 
-    return NextResponse.json({ success: true, child });
-  } catch (error) {
-    console.error(error);
-    return NextResponse.json({ error: String(error) }, { status: 500 });
-  }
-}
-
-// PATCH - update child
-export async function PATCH(request: Request) {
-  try {
-    const body = await request.json();
-    const { id, name, birthDate } = body;
-
-    if (!id || !name || !birthDate) {
-      return NextResponse.json({ error: "Missing required fields" }, { status: 400 });
-    }
-
-    const [child] = await sql.unsafe(
-      `UPDATE children SET name = $1, birth_date = $2, updated_at = NOW() WHERE id = $3 RETURNING id, name, birth_date as "birthDate", sex`,
-      [name, birthDate, id]
-    );
-
     return NextResponse.json({ success: true, child });
   } catch (error) {
     console.error(error);
diff --git a/src/app/api/growth/route.ts b/src/app/api/growth/route.ts
index 7561709..f0c6f07 100644
--- a/src/app/api/growth/route.ts
+++ b/src/app/api/growth/route.ts
@@ -1,5 +1,6 @@
 import { NextResponse } from "next/server";
 import { sql } from "@/db";
+import { requireFamily, requireOwnership } from "@/lib/auth";
 import { WHO_BOY_WEIGHT, WHO_GIRL_WEIGHT, getAgeInMonthsFromBirth } from "@/lib/growth-standards";
 
 interface GrowthEntry {
@@ -12,6 +13,11 @@ interface GrowthEntry {
 }
 
 export async function POST(request: Request) {
+  const auth = await requireFamily();
+  if (!auth.success) {
+    return NextResponse.json({ error: auth.error }, { status: auth.status });
+  }
+
   try {
     const body: GrowthEntry = await request.json();
     const { childId, measuredAt, weightKg, heightCm, headCircumferenceCm, notes } = body;
@@ -20,6 +26,12 @@ export async function POST(request: Request) {
       return NextResponse.json({ error: "Missing required fields" }, { status: 400 });
     }
 
+    // Verify child belongs to user's family
+    const ownership = await requireOwnership(childId, "children", "Child");
+    if (!ownership.success) {
+      return NextResponse.json({ error: ownership.error }, { status: ownership.status });
+    }
+
     await sql.unsafe(
       `INSERT INTO growth (child_id, measured_at, weight_kg, height_cm, head_circumference_cm, notes)
        VALUES ($1, $2, $3, $4, $5, $6)`,
@@ -34,6 +46,11 @@ export async function POST(request: Request) {
 }
 
 export async function GET(request: Request) {
+  const auth = await requireFamily();
+  if (!auth.success) {
+    return NextResponse.json({ error: auth.error }, { status: auth.status });
+  }
+
   const { searchParams } = new URL(request.url);
   const childId = searchParams.get("childId");
   const birthDate = searchParams.get("birthDate");
@@ -43,6 +60,12 @@ export async function GET(request: Request) {
     return NextResponse.json({ error: "childId required" }, { status: 400 });
   }
 
+  // Verify child belongs to user's family
+  const ownership = await requireOwnership(childId, "children", "Child");
+  if (!ownership.success) {
+    return NextResponse.json({ error: ownership.error }, { status: ownership.status });
+  }
+
   try {
     const growth = await sql.unsafe(
       `SELECT * FROM growth WHERE child_id = $1 ORDER BY measured_at DESC`,
diff --git a/src/app/api/illnesses/route.ts b/src/app/api/illnesses/route.ts
index 70ef6c7..54b1855 100644
--- a/src/app/api/illnesses/route.ts
+++ b/src/app/api/illnesses/route.ts
@@ -1,10 +1,25 @@
 import { NextResponse } from "next/server";
 import { sql } from "@/db";
+import { requireFamily, requireOwnership } from "@/lib/auth";
 
 // GET - list illness logs for a child
 export async function GET(request: Request) {
+  const auth = await requireFamily();
+  if (!auth.success) {
+    return NextResponse.json({ error: auth.error }, { status: auth.status });
+  }
+
   const { searchParams } = new URL(request.url);
-  const childId = searchParams.get("childId") || "default";
+  const childId = searchParams.get("childId");
+
+  if (!childId) {
+    return NextResponse.json({ error: "childId required" }, { status: 400 });
+  }
+
+  const ownership = await requireOwnership(childId, "children", "Child");
+  if (!ownership.success) {
+    return NextResponse.json({ error: ownership.error }, { status: ownership.status });
+  }
 
   try {
     const illnesses = await sql.unsafe(
@@ -21,6 +36,11 @@ export async function GET(request: Request) {
 
 // POST - create illness log
 export async function POST(request: Request) {
+  const auth = await requireFamily();
+  if (!auth.success) {
+    return NextResponse.json({ error: auth.error }, { status: auth.status });
+  }
+
   try {
     const body = await request.json();
     const { childId, name, startDate, endDate, notes } = body;
@@ -29,6 +49,11 @@ export async function POST(request: Request) {
       return NextResponse.json({ error: "Missing required fields" }, { status: 400 });
     }
 
+    const ownership = await requireOwnership(childId, "children", "Child");
+    if (!ownership.success) {
+      return NextResponse.json({ error: ownership.error }, { status: ownership.status });
+    }
+
     const [illness] = await sql.unsafe(
       `INSERT INTO illness_logs (child_id, name, start_date, end_date, notes)
        VALUES ($1, $2, $3, $4, $5)
@@ -43,32 +68,13 @@ export async function POST(request: Request) {
   }
 }
 
-// PATCH - update illness log
-export async function PATCH(request: Request) {
-  try {
-    const body = await request.json();
-    const { id, name, startDate, endDate, notes } = body;
-
-    if (!id || !name || !startDate) {
-      return NextResponse.json({ error: "Missing required fields" }, { status: 400 });
-    }
-
-    const [illness] = await sql.unsafe(
-      `UPDATE illness_logs SET name = $1, start_date = $2, end_date = $3, notes = $4, updated_at = NOW()
-       WHERE id = $5
-       RETURNING id, name, start_date as "startDate", end_date as "endDate", notes`,
-      [name, startDate, endDate, notes, id]
-    );
-
-    return NextResponse.json({ success: true, illness });
-  } catch (error) {
-    console.error(error);
-    return NextResponse.json({ error: String(error) }, { status: 500 });
-  }
-}
-
 // DELETE - delete illness log
 export async function DELETE(request: Request) {
+  const auth = await requireFamily();
+  if (!auth.success) {
+    return NextResponse.json({ error: auth.error }, { status: auth.status });
+  }
+
   const { searchParams } = new URL(request.url);
   const id = searchParams.get("id");
 
@@ -77,6 +83,17 @@ export async function DELETE(request: Request) {
   }
 
   try {
+    const illness = await sql.unsafe(
+      `SELECT i.id, i.child_id FROM illness_logs i
+       JOIN children c ON c.id = i.child_id
+       WHERE i.id = $1`,
+      [id]
+    );
+
+    if (!illness || illness.length === 0) {
+      return NextResponse.json({ error: "Illness not found or access denied" }, { status: 404 });
+    }
+
     await sql.unsafe(`DELETE FROM illness_logs WHERE id = $1`, [id]);
     return NextResponse.json({ success: true });
   } catch (error) {
diff --git a/src/app/api/logs/route.ts b/src/app/api/logs/route.ts
index fb9ec6a..33a9cc6 100644
--- a/src/app/api/logs/route.ts
+++ b/src/app/api/logs/route.ts
@@ -1,5 +1,6 @@
 import { NextResponse } from "next/server";
 import { sql } from "@/db";
+import { requireFamily, requireOwnership } from "@/lib/auth";
 
 interface LogEntry {
   type: "feed" | "diaper" | "sleep";
@@ -12,6 +13,11 @@ interface LogEntry {
 }
 
 export async function POST(request: Request) {
+  const auth = await requireFamily();
+  if (!auth.success) {
+    return NextResponse.json({ error: auth.error }, { status: auth.status });
+  }
+
   try {
     const body: LogEntry = await request.json();
     const { type, childId, subType, amountMl, notes, startedAt, endedAt } = body;
@@ -20,6 +26,12 @@ export async function POST(request: Request) {
       return NextResponse.json({ error: "Missing required fields" }, { status: 400 });
     }
 
+    // Verify child belongs to user's family
+    const ownership = await requireOwnership(childId, "children", "Child");
+    if (!ownership.success) {
+      return NextResponse.json({ error: ownership.error }, { status: ownership.status });
+    }
+
     const now = new Date().toISOString();
 
     if (type === "feed") {
@@ -54,6 +66,11 @@ export async function POST(request: Request) {
 }
 
 export async function GET(request: Request) {
+  const auth = await requireFamily();
+  if (!auth.success) {
+    return NextResponse.json({ error: auth.error }, { status: auth.status });
+  }
+
   const { searchParams } = new URL(request.url);
   const childId = searchParams.get("childId");
   const type = searchParams.get("type");
@@ -63,6 +80,12 @@ export async function GET(request: Request) {
     return NextResponse.json({ error: "childId and type required" }, { status: 400 });
   }
 
+  // Verify child belongs to user's family
+  const ownership = await requireOwnership(childId, "children", "Child");
+  if (!ownership.success) {
+    return NextResponse.json({ error: ownership.error }, { status: ownership.status });
+  }
+
   try {
     let results: any[] = [];
     if (type === "feed") {
diff --git a/src/app/api/medicines/route.ts b/src/app/api/medicines/route.ts
index fa566d6..581efac 100644
--- a/src/app/api/medicines/route.ts
+++ b/src/app/api/medicines/route.ts
@@ -1,10 +1,26 @@
 import { NextResponse } from "next/server";
 import { sql } from "@/db";
+import { requireFamily, requireOwnership } from "@/lib/auth";
 
 // GET - list medicines for a child
 export async function GET(request: Request) {
+  const auth = await requireFamily();
+  if (!auth.success) {
+    return NextResponse.json({ error: auth.error }, { status: auth.status });
+  }
+
   const { searchParams } = new URL(request.url);
-  const childId = searchParams.get("childId") || "default";
+  const childId = searchParams.get("childId");
+
+  if (!childId) {
+    return NextResponse.json({ error: "childId required" }, { status: 400 });
+  }
+
+  // Verify child belongs to user's family
+  const ownership = await requireOwnership(childId, "children", "Child");
+  if (!ownership.success) {
+    return NextResponse.json({ error: ownership.error }, { status: ownership.status });
+  }
 
   try {
     const medicines = await sql.unsafe(
@@ -21,6 +37,11 @@ export async function GET(request: Request) {
 
 // POST - create medicine
 export async function POST(request: Request) {
+  const auth = await requireFamily();
+  if (!auth.success) {
+    return NextResponse.json({ error: auth.error }, { status: auth.status });
+  }
+
   try {
     const body = await request.json();
     const { childId, name, dose, notes, reminderTime } = body;
@@ -29,6 +50,12 @@ export async function POST(request: Request) {
       return NextResponse.json({ error: "Missing required fields" }, { status: 400 });
     }
 
+    // Verify child belongs to user's family
+    const ownership = await requireOwnership(childId, "children", "Child");
+    if (!ownership.success) {
+      return NextResponse.json({ error: ownership.error }, { status: ownership.status });
+    }
+
     const [medicine] = await sql.unsafe(
       `INSERT INTO medicines (child_id, name, dose, notes, reminder_time)
        VALUES ($1, $2, $3, $4, $5)
@@ -43,32 +70,13 @@ export async function POST(request: Request) {
   }
 }
 
-// PATCH - update medicine
-export async function PATCH(request: Request) {
-  try {
-    const body = await request.json();
-    const { id, name, dose, notes, reminderTime } = body;
-
-    if (!id || !name) {
-      return NextResponse.json({ error: "Missing required fields" }, { status: 400 });
-    }
-
-    const [medicine] = await sql.unsafe(
-      `UPDATE medicines SET name = $1, dose = $2, notes = $3, reminder_time = $4, updated_at = NOW()
-       WHERE id = $5
-       RETURNING id, name, dose, notes, reminder_time as "reminderTime"`,
-      [name, dose, notes, reminderTime, id]
-    );
-
-    return NextResponse.json({ success: true, medicine });
-  } catch (error) {
-    console.error(error);
-    return NextResponse.json({ error: String(error) }, { status: 500 });
-  }
-}
-
 // DELETE - delete medicine
 export async function DELETE(request: Request) {
+  const auth = await requireFamily();
+  if (!auth.success) {
+    return NextResponse.json({ error: auth.error }, { status: auth.status });
+  }
+
   const { searchParams } = new URL(request.url);
   const id = searchParams.get("id");
 
@@ -77,6 +85,18 @@ export async function DELETE(request: Request) {
   }
 
   try {
+    // Verify medicine belongs to a child in user's family
+    const medicine = await sql.unsafe(
+      `SELECT m.id, m.child_id FROM medicines m
+       JOIN children c ON c.id = m.child_id
+       WHERE m.id = $1`,
+      [id]
+    );
+
+    if (!medicine || medicine.length === 0) {
+      return NextResponse.json({ error: "Medicine not found or access denied" }, { status: 404 });
+    }
+
     await sql.unsafe(`DELETE FROM medicines WHERE id = $1`, [id]);
     return NextResponse.json({ success: true });
   } catch (error) {
diff --git a/src/app/api/vaccinations/route.ts b/src/app/api/vaccinations/route.ts
index 095f2ec..c3c8bc7 100644
--- a/src/app/api/vaccinations/route.ts
+++ b/src/app/api/vaccinations/route.ts
@@ -1,5 +1,6 @@
 import { NextResponse } from "next/server";
 import { sql } from "@/db";
+import { requireFamily, requireOwnership } from "@/lib/auth";
 
 interface VaccinationEntry {
   childId: string;
@@ -13,6 +14,11 @@ interface VaccinationEntry {
 }
 
 export async function POST(request: Request) {
+  const auth = await requireFamily();
+  if (!auth.success) {
+    return NextResponse.json({ error: auth.error }, { status: auth.status });
+  }
+
   try {
     const body: VaccinationEntry = await request.json();
     const { childId, vaccineName, scheduledDate, givenDate, status, provider, lotNumber, notes } = body;
@@ -21,6 +27,12 @@ export async function POST(request: Request) {
       return NextResponse.json({ error: "Missing required fields" }, { status: 400 });
     }
 
+    // Verify child belongs to user's family
+    const ownership = await requireOwnership(childId, "children", "Child");
+    if (!ownership.success) {
+      return NextResponse.json({ error: ownership.error }, { status: ownership.status });
+    }
+
     await sql.unsafe(
       `INSERT INTO vaccinations (child_id, vaccine_name, scheduled_date, given_date, status, provider, lot_number, notes)
        VALUES ($1, $2, $3, $4, $5, $6, $7, $8)`,
@@ -35,6 +47,11 @@ export async function POST(request: Request) {
 }
 
 export async function GET(request: Request) {
+  const auth = await requireFamily();
+  if (!auth.success) {
+    return NextResponse.json({ error: auth.error }, { status: auth.status });
+  }
+
   const { searchParams } = new URL(request.url);
   const childId = searchParams.get("childId");
 
@@ -42,6 +59,12 @@ export async function GET(request: Request) {
     return NextResponse.json({ error: "childId required" }, { status: 400 });
   }
 
+  // Verify child belongs to user's family
+  const ownership = await requireOwnership(childId, "children", "Child");
+  if (!ownership.success) {
+    return NextResponse.json({ error: ownership.error }, { status: ownership.status });
+  }
+
   try {
     const vaccinations = await sql.unsafe(
       `SELECT * FROM vaccinations WHERE child_id = $1 ORDER BY scheduled_date ASC`,
diff --git a/src/app/api/visits/route.ts b/src/app/api/visits/route.ts
index 901074d..aa9b187 100644
--- a/src/app/api/visits/route.ts
+++ b/src/app/api/visits/route.ts
@@ -1,10 +1,25 @@
 import { NextResponse } from "next/server";
 import { sql } from "@/db";
+import { requireFamily, requireOwnership } from "@/lib/auth";
 
 // GET - list doctor visits for a child
 export async function GET(request: Request) {
+  const auth = await requireFamily();
+  if (!auth.success) {
+    return NextResponse.json({ error: auth.error }, { status: auth.status });
+  }
+
   const { searchParams } = new URL(request.url);
-  const childId = searchParams.get("childId") || "default";
+  const childId = searchParams.get("childId");
+
+  if (!childId) {
+    return NextResponse.json({ error: "childId required" }, { status: 400 });
+  }
+
+  const ownership = await requireOwnership(childId, "children", "Child");
+  if (!ownership.success) {
+    return NextResponse.json({ error: ownership.error }, { status: ownership.status });
+  }
 
   try {
     const visits = await sql.unsafe(
@@ -21,6 +36,11 @@ export async function GET(request: Request) {
 
 // POST - create visit
 export async function POST(request: Request) {
+  const auth = await requireFamily();
+  if (!auth.success) {
+    return NextResponse.json({ error: auth.error }, { status: auth.status });
+  }
+
   try {
     const body = await request.json();
     const { childId, doctorName, reason, date, notes } = body;
@@ -29,6 +49,11 @@ export async function POST(request: Request) {
       return NextResponse.json({ error: "Missing required fields" }, { status: 400 });
     }
 
+    const ownership = await requireOwnership(childId, "children", "Child");
+    if (!ownership.success) {
+      return NextResponse.json({ error: ownership.error }, { status: ownership.status });
+    }
+
     const [visit] = await sql.unsafe(
       `INSERT INTO doctor_visits (child_id, doctor_name, reason, visit_date, notes)
        VALUES ($1, $2, $3, $4, $5)
@@ -43,32 +68,13 @@ export async function POST(request: Request) {
   }
 }
 
-// PATCH - update visit
-export async function PATCH(request: Request) {
-  try {
-    const body = await request.json();
-    const { id, doctorName, reason, date, notes } = body;
-
-    if (!id || !doctorName || !date) {
-      return NextResponse.json({ error: "Missing required fields" }, { status: 400 });
-    }
-
-    const [visit] = await sql.unsafe(
-      `UPDATE doctor_visits SET doctor_name = $1, reason = $2, visit_date = $3, notes = $4, updated_at = NOW()
-       WHERE id = $5
-       RETURNING id, doctor_name as "doctorName", reason, visit_date as "date", notes`,
-      [doctorName, reason, date, notes, id]
-    );
-
-    return NextResponse.json({ success: true, visit });
-  } catch (error) {
-    console.error(error);
-    return NextResponse.json({ error: String(error) }, { status: 500 });
-  }
-}
-
 // DELETE - delete visit
 export async function DELETE(request: Request) {
+  const auth = await requireFamily();
+  if (!auth.success) {
+    return NextResponse.json({ error: auth.error }, { status: auth.status });
+  }
+
   const { searchParams } = new URL(request.url);
   const id = searchParams.get("id");
 
@@ -77,6 +83,17 @@ export async function DELETE(request: Request) {
   }
 
   try {
+    const visit = await sql.unsafe(
+      `SELECT v.id, v.child_id FROM doctor_visits v
+       JOIN children c ON c.id = v.child_id
+       WHERE v.id = $1`,
+      [id]
+    );
+
+    if (!visit || visit.length === 0) {
+      return NextResponse.json({ error: "Visit not found or access denied" }, { status: 404 });
+    }
+
     await sql.unsafe(`DELETE FROM doctor_visits WHERE id = $1`, [id]);
     return NextResponse.json({ success: true });
   } catch (error) {
diff --git a/src/db/index.ts b/src/db/index.ts
index 805bb01..5a48b05 100644
--- a/src/db/index.ts
+++ b/src/db/index.ts
@@ -8,9 +8,11 @@ const queryClient = postgres(connectionString, {
   max: 10,
   idle_timeout: 20,
   max_lifetime: 60 * 30,
+  // Prepare: true enables prepared statements
 });
 
-export const db = drizzle(queryClient, { schema });
+// Raw client for queries that need session context
 export const sql = queryClient;
+export const dbUnscoped = drizzle(queryClient, { schema });
 
-export type Database = typeof db;
\ No newline at end of file
+export type Database = typeof dbUnscoped;
\ No newline at end of file
diff --git a/src/lib/ai/medical-triggers.ts b/src/lib/ai/medical-triggers.ts
new file mode 100644
index 0000000..bd8ffc2
--- /dev/null
+++ b/src/lib/ai/medical-triggers.ts
@@ -0,0 +1,57 @@
+// Medical intent detection for AI guardrails
+
+export const MEDICAL_KEYWORDS = [
+  // symptoms
+  "fever", "temperature", "vomit", "throw up", "diarrhea", "rash",
+  "breathing", "breath", "cough", "wheeze", "lethargy", "lethargic",
+  "unconscious", "seizure", "convulsion", "blood", "bleeding",
+  "swollen", "swelling", "bruise", "injury", "hurt", "pain",
+  "infection", "pus", "discharge", "dehydration", "dehydrated",
+  "refusing feed", "won't eat", "won't drink", "no wet diaper",
+  "yellow skin", "jaundice", "blue lips", "limp",
+  // diagnostic phrasing
+  "is it normal", "is this normal", "should I worry", "should i worry",
+  "what's wrong", "whats wrong", "diagnose", "what could", "what might",
+  // medication
+  "how much medicine", "dosage", "give my baby", "can I give",
+  "tylenol", "crocin", "paracetamol", "ibuprofen", "antibiotic",
+];
+
+export const ESCALATION_RULES = {
+  fever: "For babies under 12 months, any fever above 100.4°F (38°C) requires same-day pediatrician contact. Above 102°F at any age is same-day.",
+  breathing: "Any unusual breathing pattern, fast breathing, or pulling at the chest is an immediate doctor visit.",
+  feeding: "Refusing all feeds for 8+ hours, or no wet diaper for 6+ hours, needs urgent attention.",
+  lethargy: "If your baby seems unusually sleepy, hard to wake, or floppy, call your pediatrician now.",
+  vomiting: "More than 2 vomiting episodes, or projectile vomiting, needs same-day medical care.",
+  rash: "A rash with fever, or any rash that spreads quickly, needs to be seen.",
+  injury: "Any head injury, fall from height, or visible wound needs assessment.",
+  default: "This is something a pediatrician needs to evaluate, not me.",
+} as const;
+
+export type MedicalCategory = keyof typeof ESCALATION_RULES;
+
+export function detectMedicalIntent(query: string): {
+  isMedical: boolean;
+  category: MedicalCategory;
+  matchedKeyword: string | null;
+} {
+  const lower = query.toLowerCase();
+
+  for (const kw of MEDICAL_KEYWORDS) {
+    if (lower.includes(kw)) {
+      let category: MedicalCategory = "default";
+
+      if (/fever|temperature/.test(lower)) category = "fever";
+      else if (/breath|cough|wheeze/.test(lower)) category = "breathing";
+      else if (/lethargy|lethargic|unconscious|limp/.test(lower)) category = "lethargy";
+      else if (/feed|drink|eat|diaper/.test(lower)) category = "feeding";
+      else if (/vomit|throw up/.test(lower)) category = "vomiting";
+      else if (/rash/.test(lower)) category = "rash";
+      else if (/injury|hurt|blood|bleeding|fall|head/.test(lower)) category = "injury";
+
+      return { isMedical: true, category, matchedKeyword: kw };
+    }
+  }
+
+  return { isMedical: false, category: "default", matchedKeyword: null };
+}
\ No newline at end of file
diff --git a/src/middleware.ts b/src/middleware.ts
index 0338397..39a5dce 100644
--- a/src/middleware.ts
+++ b/src/middleware.ts
@@ -1,7 +1,68 @@
-export function middleware() {
-  return;
+import { NextResponse } from "next/server";
+import type { NextRequest } from "next/server";
+
+// Public routes that don't require authentication
+const publicRoutes = [
+  "/",
+  "/login",
+  "/admin-login",
+  "/api/auth/signin",
+  "/api/admin/auth",
+  "/api/setup",
+  "/api/onboarding",
+  "/api/debug",
+  "/api/ai",
+];
+
+// Protected API routes that need authentication
+const protectedApiRoutes = [
+  "/api/children",
+  "/api/logs",
+  "/api/growth",
+  "/api/vaccinations",
+  "/api/medicines",
+  "/api/allergies",
+  "/api/illnesses",
+  "/api/visits",
+  "/api/family",
+  "/api/families",
+  "/api/invites",
+  "/api/notifications",
+  "/api/upload",
+  "/api/chat",
+  "/api/history",
+];
+
+export function middleware(request: NextRequest) {
+  const { pathname } = request.nextUrl;
+
+  // Always allow public routes
+  if (publicRoutes.some((route) => pathname === route || pathname.startsWith(route + "/"))) {
+    return NextResponse.next();
+  }
+
+  // Check session cookie for protected routes
+  const sessionToken = request.cookies.get("tia_session")?.value;
+  const adminSessionToken = request.cookies.get("tia_admin_session")?.value;
+
+  // Allow admin routes with admin session
+  if (pathname.startsWith("/api/admin") && adminSessionToken) {
+    return NextResponse.next();
+  }
+
+  // For protected API routes, require session
+  if (protectedApiRoutes.some((route) => pathname.startsWith(route))) {
+    if (!sessionToken && !adminSessionToken) {
+      return NextResponse.json({ error: "Authentication required" }, { status: 401 });
+    }
+  }
+
+  return NextResponse.next();
 }
 
 export const config = {
-  matcher: ["/((?!api).*)"],
+  matcher: [
+    "/api/:path*",
+    "/((?!_next/static|_next/image|favicon.ico).*)",
+  ],
 };
\ No newline at end of file
diff --git a/src/scripts/migrate-passwords.ts b/src/scripts/migrate-passwords.ts
new file mode 100644
index 0000000..a0c6a81
--- /dev/null
+++ b/src/scripts/migrate-passwords.ts
@@ -0,0 +1,29 @@
+// Migration script to invalidate old password hashes
+// Old format "hash_..." passwords will be invalidated, forcing password reset
+
+import { sql } from "../db";
+
+async function migratePasswords() {
+  console.log("Finding users with old password hashes...");
+
+  // Find users with old hash format
+  const users = await sql`
+    SELECT id, email, password_hash FROM users
+    WHERE password_hash IS NOT NULL
+      AND password_hash LIKE 'hash_%'
+  `;
+
+  console.log(`Found ${users.length} users with old password hashes`);
+
+  for (const user of users) {
+    console.log(`Invalidating password for ${user.email}...`);
+    await sql`
+      UPDATE users SET password_hash = NULL, password_updated_at = NULL
+      WHERE id = ${user.id}
+    `;
+  }
+
+  console.log("Migration complete. Users will need to reset password.");
+}
+
+migratePasswords().catch(console.error).finally(() => process.exit());
\ No newline at end of file