feat(db): migration 0022 — add response tracking to lead_forwards

Adds status_updated_at, supplier_note, and cta_token columns to the
lead_forwards table. cta_token gets a unique partial index for fast
one-click email CTA lookups.

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

web/src/padelnomics/migrations/versions/0022_lead_forward_tracking.py

@@ -0,0 +1,12 @@
+"""Migration 0022: Add response tracking columns to lead_forwards."""
+
+FORWARD_STATUSES = ["sent", "viewed", "contacted", "quoted", "won", "lost", "no_response"]
+
+
+def up(conn) -> None:
+    conn.execute("ALTER TABLE lead_forwards ADD COLUMN status_updated_at TEXT")
+    conn.execute("ALTER TABLE lead_forwards ADD COLUMN supplier_note TEXT")
+    conn.execute("ALTER TABLE lead_forwards ADD COLUMN cta_token TEXT")
+    conn.execute(
+        "CREATE UNIQUE INDEX IF NOT EXISTS idx_lead_forwards_cta_token ON lead_forwards(cta_token) WHERE cta_token IS NOT NULL"
+    )