feat: auto-create Resend audiences per blueprint

Removes RESEND_AUDIENCE_WAITLIST env var. capture_waitlist_email() now
derives audience name from request.blueprints[0] (e.g. waitlist-auth,
waitlist-suppliers), lazily creates it via Resend API on first signup,
and caches the ID in a new resend_audiences table. Zero config beyond
RESEND_API_KEY — adding @waitlist_gate to any new blueprint auto-creates
its audience on first use.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

CHANGELOG.md

@@ -6,6 +6,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
 ## [Unreleased]
 
+### Changed
+- Auto-create Resend audiences per blueprint: `capture_waitlist_email()` now derives the audience name from `request.blueprints[0]` (e.g., `waitlist-auth`, `waitlist-suppliers`) and lazily creates audiences via the Resend API on first use, caching IDs in a new `resend_audiences` table; removes `RESEND_AUDIENCE_WAITLIST` env var — only `RESEND_API_KEY` needed
+
 ### Added
 - Simple A/B testing with `@ab_test` decorator and Umami `data-tag` integration
 - SEO defaults in `base.html`: canonical, og:url, og:type, og:image (logo fallback), og:title, og:description, twitter:card — every page gets these automatically, child templates override as needed

padelnomics/docs/WAITLIST.md

@@ -1,6 +1,6 @@
 # Waitlist Mode
 
-Waitlist mode allows you to validate market demand before building features. Set `WAITLIST_MODE=true` and selected routes will show waitlist signup forms instead of the normal flow. Emails are captured to a database table and a Resend audience for later launch campaigns.
+Waitlist mode allows you to validate market demand before building features. Set `WAITLIST_MODE=true` and selected routes will show waitlist signup forms instead of the normal flow. Emails are captured to a database table and automatically segmented into per-blueprint Resend audiences for targeted launch campaigns.
 
 ## Use Cases
 
@@ -16,7 +16,7 @@ Waitlist mode allows you to validate market demand before building features. Set
 ```bash
 # Add to .env
 WAITLIST_MODE=true
-RESEND_AUDIENCE_WAITLIST=aud_xxx  # Optional: Resend audience ID for bulk campaigns
+RESEND_API_KEY=re_xyz123  # Optional: audiences created automatically per blueprint
 ```
 
 ### 2. Run migration (if not already done)
@@ -320,49 +320,54 @@ Edit `handle_send_waitlist_confirmation()` in `worker.py` to:
 
 ## Resend Integration
 
-If `RESEND_AUDIENCE_WAITLIST` is set, all waitlist signups are automatically added to that Resend audience. This enables bulk launch campaigns when you're ready to go live.
+Audiences are created automatically per blueprint — no configuration needed beyond `RESEND_API_KEY`. The first signup from each blueprint creates a named audience in Resend and caches its ID in the `resend_audiences` database table. Subsequent signups from the same blueprint skip the API call and use the cached ID.
+
+### Audience names
+
+| Route | Blueprint | Resend audience |
+|-------|-----------|-----------------|
+| `/auth/signup` | `auth` | `waitlist-auth` |
+| `/suppliers/signup/waitlist` | `suppliers` | `waitlist-suppliers` |
+| `/planner/export` | `planner` | `waitlist-planner` |
+
+Adding `@waitlist_gate` to any new blueprint automatically creates its own audience on first signup.
 
 ### Setup
 
-1. Create an audience in Resend
-2. Copy the audience ID (e.g., `aud_abc123xyz`)
-3. Add to `.env`:
+Set `RESEND_API_KEY` in `.env` — no audience IDs needed:
 
 ```bash
-RESEND_AUDIENCE_WAITLIST=aud_abc123xyz
+RESEND_API_KEY=re_xyz123
 ```
 
 ### How it works
 
-The `capture_waitlist_email()` helper automatically adds emails to the audience:
-
 ```python
-if config.RESEND_AUDIENCE_WAITLIST and config.RESEND_API_KEY:
-    try:
-        resend.api_key = config.RESEND_API_KEY
-        resend.Contacts.create({
-            "email": email,
-            "audience_id": config.RESEND_AUDIENCE_WAITLIST,
-        })
-    except Exception:
-        pass  # Silent fail - not critical
+# Derives audience name from current request's blueprint
+blueprint = request.blueprints[0] if request.blueprints else "default"
+audience_name = f"waitlist-{blueprint}"
+
+# Lazy-creates audience on first use, caches ID in resend_audiences table
+audience_id = await _get_or_create_resend_audience(audience_name)
+if audience_id:
+    resend.Contacts.create({"email": email, "audience_id": audience_id})
 ```
 
 **Silent failures:**
+- `Audiences.create` error → `audience_id` is None, contact skipped
+- `Contacts.create` error → ignored
 - Duplicate emails (already in audience) → ignored
-- Rate limits → ignored
-- API errors → ignored
+- API rate limits → ignored
 
-This ensures waitlist signups always succeed even if Resend is down.
+Waitlist signups always succeed even if Resend is down.
 
 ### Launch campaign
 
 When ready to launch:
 
-1. Go to Resend dashboard → Audiences → your waitlist audience
-2. Export contacts (CSV)
-3. Create a broadcast email: "We're live! Here's your early access..."
-4. Send to the audience
+1. Go to Resend dashboard → Audiences → select the segment (e.g., `waitlist-suppliers`)
+2. Create a broadcast email: "We're live! Here's your early access..."
+3. Send to the audience
 
 ---
 
@@ -513,15 +518,15 @@ SELECT DISTINCT email FROM waitlist;
 | Variable | Type | Default | Description |
 |----------|------|---------|-------------|
 | `WAITLIST_MODE` | bool | `false` | Enable waitlist gates on routes |
-| `RESEND_AUDIENCE_WAITLIST` | string | `""` | Resend audience ID for bulk campaigns |
+| `RESEND_API_KEY` | string | `""` | Resend API key — audiences created automatically per blueprint |
 
 ### Usage
 
 ```bash
 # .env
 WAITLIST_MODE=true
-RESEND_AUDIENCE_WAITLIST=aud_abc123xyz
 RESEND_API_KEY=re_xyz123
+# No audience IDs needed — created automatically on first signup
 ```
 
 ### Config Access
@@ -675,8 +680,8 @@ uv run python -m padelnomics.worker
 **Symptoms:** Emails captured, confirmations sent, but not appearing in Resend audience
 
 **Causes:**
-1. `RESEND_AUDIENCE_WAITLIST` not set
-2. Invalid audience ID
+1. `RESEND_API_KEY` not set
+2. `Audiences.create` API error on first signup (check logs)
 3. Resend API rate limit
 4. Contacts already in audience (silent duplicate)
 
@@ -685,12 +690,17 @@ uv run python -m padelnomics.worker
 # Check config
 uv run python -c "
 from padelnomics.core import config
-print('Audience:', config.RESEND_AUDIENCE_WAITLIST)
 print('API key:', 'Set' if config.RESEND_API_KEY else 'Not set')
 "
 
-# Verify audience ID in Resend dashboard
-# Format: aud_xxxxxxxxxxxxx
+# Check resend_audiences table for cached IDs
+uv run python -c "
+import sqlite3
+conn = sqlite3.connect('data/app.db')
+rows = conn.execute('SELECT * FROM resend_audiences').fetchall()
+for row in rows:
+    print(row)
+"
 ```
 
 ### Decorator not intercepting GET requests
@@ -750,7 +760,7 @@ async def signup():
         # Enqueue email
         await enqueue("send_waitlist_confirmation", {"email": email, "intent": "signup"})
 
-        # Add to Resend
+        # Add to Resend (old: manual audience ID required)
         if config.RESEND_AUDIENCE_WAITLIST:
             try:
                 resend.Contacts.create(...)

padelnomics/src/padelnomics/core.py

@@ -60,8 +60,6 @@ class Config:
     ]
     RESEND_AUDIENCE_PLANNER: str = os.getenv("RESEND_AUDIENCE_PLANNER", "")
     WAITLIST_MODE: bool = os.getenv("WAITLIST_MODE", "false").lower() == "true"
-    # Optional Resend audience ID for bulk launch blast when waitlist is ready
-    RESEND_AUDIENCE_WAITLIST: str = os.getenv("RESEND_AUDIENCE_WAITLIST", "")
 
     RATE_LIMIT_REQUESTS: int = int(os.getenv("RATE_LIMIT_REQUESTS", "100"))
     RATE_LIMIT_WINDOW: int = int(os.getenv("RATE_LIMIT_WINDOW", "60"))
@@ -205,6 +203,25 @@ async def send_email(
 # Waitlist
 # =============================================================================
 
+async def _get_or_create_resend_audience(name: str) -> str | None:
+    """Get cached Resend audience ID, or create one via API. Returns None on failure."""
+    row = await fetch_one("SELECT audience_id FROM resend_audiences WHERE name = ?", (name,))
+    if row:
+        return row["audience_id"]
+
+    try:
+        resend.api_key = config.RESEND_API_KEY
+        result = resend.Audiences.create({"name": name})
+        audience_id = result["id"]
+        await execute(
+            "INSERT OR IGNORE INTO resend_audiences (name, audience_id) VALUES (?, ?)",
+            (name, audience_id),
+        )
+        return audience_id
+    except Exception:
+        return None
+
+
 async def capture_waitlist_email(email: str, intent: str, plan: str = None, email_intent: str = None) -> bool:
     """Insert email into waitlist, enqueue confirmation, add to Resend audience.
 
@@ -235,13 +252,14 @@ async def capture_waitlist_email(email: str, intent: str, plan: str = None, emai
         await enqueue("send_waitlist_confirmation", {"email": email, "intent": email_intent_value})
 
     # Add to Resend audience (silent fail - not critical)
-    if config.RESEND_AUDIENCE_WAITLIST and config.RESEND_API_KEY:
+    if config.RESEND_API_KEY:
+        blueprint = request.blueprints[0] if request.blueprints else "default"
+        audience_name = f"waitlist-{blueprint}"
+        audience_id = await _get_or_create_resend_audience(audience_name)
+        if audience_id:
             try:
                 resend.api_key = config.RESEND_API_KEY
-            resend.Contacts.create({
-                "email": email,
-                "audience_id": config.RESEND_AUDIENCE_WAITLIST,
-            })
+                resend.Contacts.create({"email": email, "audience_id": audience_id})
             except Exception:
                 pass  # Silent fail
 

padelnomics/src/padelnomics/migrations/versions/0015_add_resend_audiences.py

@@ -0,0 +1,12 @@
+"""Cache table for lazily-created Resend audience IDs."""
+
+
+def up(conn):
+    conn.execute("""
+        CREATE TABLE IF NOT EXISTS resend_audiences (
+            name        TEXT PRIMARY KEY,
+            audience_id TEXT NOT NULL,
+            created_at  TEXT NOT NULL DEFAULT (datetime('now'))
+        )
+    """)
+    conn.commit()

padelnomics/tests/test_waitlist.py

@@ -79,11 +79,6 @@ class TestConfiguration:
         assert hasattr(core.config, "WAITLIST_MODE")
         assert isinstance(core.config.WAITLIST_MODE, bool)
 
-    def test_resend_audience_waitlist_exists(self):
-        """RESEND_AUDIENCE_WAITLIST config should exist."""
-        assert hasattr(core.config, "RESEND_AUDIENCE_WAITLIST")
-        assert isinstance(core.config.RESEND_AUDIENCE_WAITLIST, str)
-
     def test_waitlist_mode_can_be_enabled(self):
         """WAITLIST_MODE can be set to True via config."""
         with patch.object(core.config, "WAITLIST_MODE", True):
@@ -385,22 +380,95 @@ class TestAuthRoutes:
 
     @pytest.mark.asyncio
     async def test_adds_to_resend_audience_when_configured(self, client, db):
-        """POST adds email to Resend audience if RESEND_AUDIENCE_WAITLIST is set."""
+        """POST auto-creates Resend audience per blueprint and adds the contact."""
         with patch.object(core.config, "WAITLIST_MODE", True), \
-             patch.object(core.config, "RESEND_AUDIENCE_WAITLIST", "aud_test123"), \
              patch.object(core.config, "RESEND_API_KEY", "re_test_key"), \
              patch("padelnomics.worker.enqueue", new_callable=AsyncMock), \
-             patch("resend.Contacts.create") as mock_resend:
+             patch("resend.Audiences.create", return_value={"id": "aud_test"}) as mock_create_aud, \
+             patch("resend.Contacts.create") as mock_create_contact:
 
             await client.post("/auth/signup", form={
                 "csrf_token": "test_token",
                 "email": "test@example.com",
             })
 
-            mock_resend.assert_called_once()
-            call_args = mock_resend.call_args[0][0]
+            mock_create_aud.assert_called_once_with({"name": "waitlist-auth"})
+            mock_create_contact.assert_called_once()
+            call_args = mock_create_contact.call_args[0][0]
             assert call_args["email"] == "test@example.com"
-            assert call_args["audience_id"] == "aud_test123"
+            assert call_args["audience_id"] == "aud_test"
+
+    @pytest.mark.asyncio
+    async def test_resend_audience_cached_on_second_signup(self, client, db):
+        """Second signup for same blueprint reuses cached audience — no extra API call."""
+        with patch.object(core.config, "WAITLIST_MODE", True), \
+             patch.object(core.config, "RESEND_API_KEY", "re_test_key"), \
+             patch("padelnomics.worker.enqueue", new_callable=AsyncMock), \
+             patch("resend.Audiences.create", return_value={"id": "aud_cached"}) as mock_create_aud, \
+             patch("resend.Contacts.create"):
+
+            await client.post("/auth/signup", form={
+                "csrf_token": "test_token",
+                "email": "first@example.com",
+            })
+            await client.post("/auth/signup", form={
+                "csrf_token": "test_token",
+                "email": "second@example.com",
+            })
+
+            # Audience created only once; second call reads from DB cache
+            mock_create_aud.assert_called_once()
+
+    @pytest.mark.asyncio
+    async def test_supplier_and_auth_signups_go_to_different_audiences(self, client, db):
+        """Auth and supplier signups are added to separate Resend audiences."""
+        with patch.object(core.config, "WAITLIST_MODE", True), \
+             patch.object(core.config, "RESEND_API_KEY", "re_test_key"), \
+             patch("padelnomics.worker.enqueue", new_callable=AsyncMock), \
+             patch("resend.Audiences.create", side_effect=[
+                 {"id": "aud_auth"},
+                 {"id": "aud_suppliers"},
+             ]) as mock_create_aud, \
+             patch("resend.Contacts.create") as mock_create_contact:
+
+            await client.post("/auth/signup", form={
+                "csrf_token": "test_token",
+                "email": "entrepreneur@example.com",
+            })
+            await client.post("/suppliers/signup/waitlist", form={
+                "csrf_token": "test_token",
+                "email": "supplier@example.com",
+                "plan": "supplier_growth",
+            })
+
+            audience_names = [
+                call[0][0]["name"] for call in mock_create_aud.call_args_list
+            ]
+            assert "waitlist-auth" in audience_names
+            assert "waitlist-suppliers" in audience_names
+
+            contact_audience_ids = [
+                call[0][0]["audience_id"] for call in mock_create_contact.call_args_list
+            ]
+            assert "aud_auth" in contact_audience_ids
+            assert "aud_suppliers" in contact_audience_ids
+
+    @pytest.mark.asyncio
+    async def test_resend_audience_create_failure_still_succeeds(self, client, db):
+        """Audiences.create failure is silent — signup still returns success page."""
+        with patch.object(core.config, "WAITLIST_MODE", True), \
+             patch.object(core.config, "RESEND_API_KEY", "re_test_key"), \
+             patch("padelnomics.worker.enqueue", new_callable=AsyncMock), \
+             patch("resend.Audiences.create", side_effect=Exception("Resend down")):
+
+            response = await client.post("/auth/signup", form={
+                "csrf_token": "test_token",
+                "email": "test@example.com",
+            })
+
+            assert response.status_code == 200
+            html = await response.get_data(as_text=True)
+            assert "test@example.com" in html
 
 
 # ── TestSupplierRoutes ────────────────────────────────────────────
@@ -589,8 +657,9 @@ class TestEdgeCases:
     async def test_resend_api_error_handled_gracefully(self, client, db):
         """Resend API errors don't break the flow."""
         with patch.object(core.config, "WAITLIST_MODE", True), \
-             patch.object(core.config, "RESEND_AUDIENCE_WAITLIST", "aud_test"), \
+             patch.object(core.config, "RESEND_API_KEY", "re_test_key"), \
              patch("padelnomics.worker.enqueue", new_callable=AsyncMock), \
+             patch("resend.Audiences.create", return_value={"id": "aud_test"}), \
              patch("resend.Contacts.create", side_effect=Exception("API error")):
 
             response = await client.post("/auth/signup", form={