feat: replace sequential IDs with opaque tokens in public URLs

Sequential IDs in /planner/export/<id> and /leads/<id>/unlock leaked
business volume (e.g. export_id=47 reveals ~47 PDFs sold). Replace with
22-char URL-safe tokens that carry no countable information.

- Migration 0017: adds `token TEXT` to business_plan_exports and
  lead_requests, backfills existing rows with secrets.token_urlsafe(16),
  creates unique indexes for fast lookups
- billing/routes.py: INSERT into business_plan_exports includes token
- leads/routes.py: INSERT into lead_requests includes token; enqueue
  payload includes lead_token; verify_quote() looks up by token
- planner/routes.py: /export/<token> route (was /export/<int:export_id>)
- suppliers/routes.py: /leads/<token>/unlock (was /leads/<int:lead_id>)
- worker.py: email links use token for both export and verify URLs
- Templates: url_for() calls use token= param
- test_phase0.py: _submit_guest_quote() returns (lead_id, auth_token,
  lead_token); verify URL tests use opaque lead token

Integer PKs unchanged; admin routes unchanged.

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

web/src/padelnomics/billing/routes.py

@@ -4,6 +4,7 @@ Payment provider: paddle
 """
 
 import json
+import secrets
 from datetime import datetime
 from pathlib import Path
 
@@ -453,10 +454,10 @@ async def _handle_transaction_completed(data: dict, custom_data: dict) -> None:
             transaction_id = data.get("id", "")
             export_id = await execute(
                 """INSERT INTO business_plan_exports
-                   (user_id, scenario_id, paddle_transaction_id, language, status, created_at)
-                   VALUES (?, ?, ?, ?, 'pending', ?)""",
+                   (user_id, scenario_id, paddle_transaction_id, language, status, token, created_at)
+                   VALUES (?, ?, ?, ?, 'pending', ?, ?)""",
                 (int(user_id), int(scenario_id) if scenario_id else 0,
-                 transaction_id, language, now),
+                 transaction_id, language, secrets.token_urlsafe(16), now),
             )
             # Enqueue PDF generation
             from ..worker import enqueue

web/src/padelnomics/leads/routes.py

@@ -333,8 +333,8 @@ async def quote_request():
              previous_supplier_contact, services_needed, additional_info,
              contact_name, contact_email, contact_phone, contact_company,
              stakeholder_type,
-             heat_score, status, credit_cost, created_at)
-            VALUES (?, 'quote', ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)""",
+             heat_score, status, credit_cost, token, created_at)
+            VALUES (?, 'quote', ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)""",
             (
                 user_id,
                 form.get("court_count", 0),
@@ -361,6 +361,7 @@ async def quote_request():
                 heat,
                 status,
                 credit_cost,
+                secrets.token_urlsafe(16),
                 datetime.utcnow().isoformat(),
             ),
         )
@@ -422,11 +423,17 @@ async def quote_request():
         token = secrets.token_urlsafe(32)
         await create_auth_token(new_user_id, token, minutes=60)
 
+        lead_token_row = await fetch_one(
+            "SELECT token FROM lead_requests WHERE id = ?", (lead_id,)
+        )
+        lead_token = lead_token_row["token"]
+
         from ..worker import enqueue
         await enqueue("send_quote_verification", {
             "email": contact_email,
             "token": token,
             "lead_id": lead_id,
+            "lead_token": lead_token,
             "lang": g.get("lang", "en"),
             "contact_name": form.get("contact_name", ""),
             "facility_type": form.get("facility_type", ""),
@@ -466,10 +473,10 @@ async def quote_request():
 async def verify_quote():
     """Verify email from quote submission — activates lead and logs user in."""
     token_str = request.args.get("token")
-    lead_id = request.args.get("lead")
+    lead_token = request.args.get("lead")
 
     _t = get_translations(g.get("lang", "en"))
-    if not token_str or not lead_id:
+    if not token_str or not lead_token:
         await flash(_t["flash_verify_invalid"], "error")
         return redirect(url_for("leads.quote_request"))
 
@@ -479,10 +486,10 @@ async def verify_quote():
         await flash(_t["flash_verify_expired"], "error")
         return redirect(url_for("leads.quote_request"))
 
-    # Validate lead exists and is pending
+    # Validate lead exists and is pending — look up by opaque token
     lead = await fetch_one(
-        "SELECT * FROM lead_requests WHERE id = ? AND status = 'pending_verification'",
-        (lead_id,),
+        "SELECT * FROM lead_requests WHERE token = ? AND status = 'pending_verification'",
+        (lead_token,),
     )
     if not lead:
         await flash(_t["flash_verify_invalid_lead"], "error")
@@ -497,7 +504,7 @@ async def verify_quote():
     now = datetime.utcnow().isoformat()
     await execute(
         "UPDATE lead_requests SET status = 'new', verified_at = ?, credit_cost = ? WHERE id = ?",
-        (now, credit_cost, lead_id),
+        (now, credit_cost, lead["id"]),
     )
 
     # Set user name from contact_name if not already set

web/src/padelnomics/migrations/versions/0017_add_public_tokens.py

@@ -0,0 +1,46 @@
+"""Add opaque public tokens to business_plan_exports and lead_requests.
+
+Sequential integer IDs in public URLs leak business volume (e.g. export_id=47
+reveals ~47 PDFs sold). Opaque tokens hide this while keeping integer PKs for
+internal use.
+"""
+import secrets
+
+
+def up(conn):
+    # Add token columns (nullable to allow backfill before NOT NULL constraint)
+    conn.execute(
+        "ALTER TABLE business_plan_exports ADD COLUMN token TEXT"
+    )
+    conn.execute(
+        "ALTER TABLE lead_requests ADD COLUMN token TEXT"
+    )
+
+    # Backfill existing rows
+    export_ids = [row[0] for row in conn.execute(
+        "SELECT id FROM business_plan_exports WHERE token IS NULL"
+    ).fetchall()]
+    for export_id in export_ids:
+        conn.execute(
+            "UPDATE business_plan_exports SET token = ? WHERE id = ?",
+            (secrets.token_urlsafe(16), export_id),
+        )
+
+    lead_ids = [row[0] for row in conn.execute(
+        "SELECT id FROM lead_requests WHERE token IS NULL"
+    ).fetchall()]
+    for lead_id in lead_ids:
+        conn.execute(
+            "UPDATE lead_requests SET token = ? WHERE id = ?",
+            (secrets.token_urlsafe(16), lead_id),
+        )
+
+    # Unique indexes for fast token lookups
+    conn.execute(
+        "CREATE UNIQUE INDEX IF NOT EXISTS"
+        " idx_business_plan_exports_token ON business_plan_exports (token)"
+    )
+    conn.execute(
+        "CREATE UNIQUE INDEX IF NOT EXISTS"
+        " idx_lead_requests_token ON lead_requests (token)"
+    )

web/src/padelnomics/planner/routes.py

@@ -534,13 +534,13 @@ async def export_success():
     return await render_template("export_success.html", exports=exports)
 
 
-@bp.route("/export/<int:export_id>")
+@bp.route("/export/<token>")
 @login_required
-async def export_download(export_id: int):
+async def export_download(token: str):
     """Download a generated PDF."""
     export = await fetch_one(
-        "SELECT * FROM business_plan_exports WHERE id = ? AND user_id = ?",
-        (export_id, g.user["id"]),
+        "SELECT * FROM business_plan_exports WHERE token = ? AND user_id = ?",
+        (token, g.user["id"]),
     )
     if not export:
         return jsonify({"error": "Export not found."}), 404
@@ -562,7 +562,7 @@ async def export_download(export_id: int):
         pdf_bytes,
         mimetype="application/pdf",
         headers={
-            "Content-Disposition": f'attachment; filename="padel-business-plan-{export_id}.pdf"'
+            "Content-Disposition": f'attachment; filename="padel-business-plan-{export["id"]}.pdf"'
         },
     )
 

web/src/padelnomics/planner/templates/export.html

@@ -85,7 +85,7 @@
         </div>
         <div>
           {% if e.status == 'ready' %}
-          <a href="{{ url_for('planner.export_download', export_id=e.id) }}" class="btn-outline" style="font-size:0.75rem;padding:4px 12px">{{ t.export_download }}</a>
+          <a href="{{ url_for('planner.export_download', token=e.token) }}" class="btn-outline" style="font-size:0.75rem;padding:4px 12px">{{ t.export_download }}</a>
           {% elif e.status == 'pending' or e.status == 'generating' %}
           <span class="exp-status exp-status--pending">{{ t.export_generating }}</span>
           {% else %}

web/src/padelnomics/planner/templates/export_success.html

@@ -10,7 +10,7 @@
   {% if exports %}
   {% for e in exports %}
   {% if e.status == 'ready' %}
-  <a href="{{ url_for('planner.export_download', export_id=e.id) }}" class="btn" style="display:inline-block;padding:12px 32px">{{ t.export_download }}</a>
+  <a href="{{ url_for('planner.export_download', token=e.token) }}" class="btn" style="display:inline-block;padding:12px 32px">{{ t.export_download }}</a>
   {% else %}
   <div style="background:#FEF3C7;border:1px solid #FDE68A;border-radius:10px;padding:1rem;margin-bottom:1rem;font-size:0.875rem;color:#92400E">
     {{ t.export_success_status }}

web/src/padelnomics/suppliers/routes.py

@@ -504,16 +504,22 @@ async def lead_feed():
     )
 
 
-@bp.route("/leads/<int:lead_id>/unlock", methods=["POST"])
+@bp.route("/leads/<token>/unlock", methods=["POST"])
 @_lead_tier_required
 @csrf_protect
-async def unlock_lead(lead_id: int):
+async def unlock_lead(token: str):
     """Spend credits to unlock a lead. Returns full-details card via HTMX."""
     from ..credits import InsufficientCredits
     from ..credits import unlock_lead as do_unlock
 
     supplier = g.supplier
 
+    # Resolve opaque token to integer ID for internal operations
+    lead_row = await fetch_one("SELECT id FROM lead_requests WHERE token = ?", (token,))
+    if not lead_row:
+        return jsonify({"error": "Lead not found."}), 404
+    lead_id = lead_row["id"]
+
     try:
         result = await do_unlock(supplier["id"], lead_id)
     except InsufficientCredits as e:

web/src/padelnomics/suppliers/templates/suppliers/partials/dashboard_leads.html

@@ -121,7 +121,7 @@
       {% endif %}
       <div class="lf-card__foot">
         <div class="lf-card__cost"><strong>{{ lead.credit_cost or '?' }}</strong> {{ t.sd_leads_credits_to_unlock }}</div>
-        <form hx-post="{{ url_for('suppliers.unlock_lead', lead_id=lead.id) }}" hx-target="#lead-card-{{ lead.id }}" hx-swap="innerHTML">
+        <form hx-post="{{ url_for('suppliers.unlock_lead', token=lead.token) }}" hx-target="#lead-card-{{ lead.id }}" hx-swap="innerHTML">
           <input type="hidden" name="csrf_token" value="{{ csrf_token() }}">
           <button type="submit" class="lf-unlock-btn">{{ t.sd_leads_unlock }}</button>
         </form>

web/src/padelnomics/suppliers/templates/suppliers/partials/lead_card.html

@@ -25,7 +25,7 @@
 
   <div class="lf-card__foot">
     <span class="lf-card__cost"><strong>{{ lead.credit_cost or '?' }}</strong> {{ t.sd_card_credits }}</span>
-    <form hx-post="{{ url_for('suppliers.unlock_lead', lead_id=lead.id) }}"
+    <form hx-post="{{ url_for('suppliers.unlock_lead', token=lead.token) }}"
           hx-target="#lead-card-{{ lead.id }}" hx-swap="innerHTML">
       <input type="hidden" name="csrf_token" value="{{ csrf_token() }}">
       <button type="submit" class="lf-unlock-btn">{{ t.sd_card_unlock_btn }}</button>

web/src/padelnomics/worker.py

@@ -206,7 +206,7 @@ async def handle_send_quote_verification(payload: dict) -> None:
     lang = payload.get("lang", "en")
     link = (
         f"{config.BASE_URL}/{lang}/leads/verify"
-        f"?token={payload['token']}&lead={payload['lead_id']}"
+        f"?token={payload['token']}&lead={payload['lead_token']}"
     )
 
     if config.DEBUG:
@@ -526,12 +526,16 @@ async def handle_generate_business_plan(payload: dict) -> None:
         )
 
         # Notify user via email
+        export_row = await fetch_one(
+            "SELECT token FROM business_plan_exports WHERE id = ?", (export_id,)
+        )
+        export_token = export_row["token"]
         user = await fetch_one("SELECT email FROM users WHERE id = ?", (user_id,))
         if user:
             body = (
                 f'<h2 style="margin:0 0 16px;color:#0F172A;font-size:20px;">Your Business Plan is Ready</h2>'
                 f"<p>Your padel business plan PDF has been generated and is ready for download.</p>"
-                f'{_email_button(f"{config.BASE_URL}/planner/export/{export_id}", "Download PDF")}'
+                f'{_email_button(f"{config.BASE_URL}/planner/export/{export_token}", "Download PDF")}'
             )
             await send_email(
                 to=user["email"],