Allow multiple referral codes per sales agent

Drop the UNIQUE constraint on sales_agents.email (migration 084) so a single
agent (person/company) can hold several referral codes, each with its own
client discount and commission split. All commission lookups already key on
the unique agent_code, so no lookup logic changes.

Agent-creation endpoint now:
- accepts repeat emails (creates an additional code instead of 409)
- accepts client_discount_value, commission_type, commission_pct per code
- reports existing codes for the email in the response

Both Jay Kordic codes (REF-JKORDIC 7%/12%, REF-JAYK05 5%/15%) now share his
real email jay_kordic@thehorizongroup.biz.

api/migrations/084_multi_code_per_agent.sql

@@ -0,0 +1,23 @@
+-- 084_multi_code_per_agent.sql
+-- Allow a single sales agent (person/company) to have MULTIPLE referral codes,
+-- each with its own client discount and agent commission split.
+--
+-- Background: each sales_agents row already represents one referral code
+-- (it owns a unique agent_code and links to one discount_code). The only thing
+-- that blocked the same person from having several codes was the UNIQUE
+-- constraint on sales_agents.email. We drop that constraint (keeping a plain
+-- index for lookups) so the same email can back several codes/splits.
+--
+-- All commission/referral lookups key on the unique agent_code, so no other
+-- logic changes are required at the DB level.
+
+BEGIN;
+
+-- Drop the UNIQUE constraint on email (name is auto-generated by Postgres).
+ALTER TABLE sales_agents DROP CONSTRAINT IF EXISTS sales_agents_email_key;
+
+-- Keep a non-unique index so email lookups stay fast.
+-- (idx_agents_email already exists from migration 011; create defensively.)
+CREATE INDEX IF NOT EXISTS idx_agents_email ON sales_agents (email);
+
+COMMIT;

api/src/routes/agents.ts

@@ -76,18 +76,30 @@ export async function createCommission(params: {
 // =====================================================================
 router.post("/api/v1/admin/agents", requireAdmin, async (req, res) => {
   try {
-    const { name, email, phone, company, commission_default_cents, commission_pct, commission_overrides, notes } = req.body ?? {};
+    const {
+      name, email, phone, company,
+      commission_type, commission_default_cents, commission_pct, commission_overrides,
+      client_discount_value, notes,
+    } = req.body ?? {};
     if (!name || !email) {
       res.status(400).json({ error: "Name and email are required." });
       return;
     }
 
-    // Check for duplicate email
-    const existing = await pool.query("SELECT id FROM sales_agents WHERE email = $1", [email.toLowerCase().trim()]);
-    if (existing.rows.length > 0) {
-      res.status(409).json({ error: "An agent with this email already exists." });
-      return;
-    }
+    // A single agent (person/company) may hold MULTIPLE referral codes, each with
+    // its own client discount + commission split. We therefore allow repeat emails;
+    // each call creates a new code. We surface any existing codes for the same email
+    // in the response so the caller knows it's an additional code, not a mistake.
+    const existing = await pool.query(
+      "SELECT agent_code, commission_pct FROM sales_agents WHERE email = $1 ORDER BY created_at",
+      [email.toLowerCase().trim()],
+    );
+    const existingCodes = existing.rows.map((r) => r.agent_code);
+
+    // Per-code config (defaults preserve prior behaviour: 5% client discount, 10% commission)
+    const clientDiscount = client_discount_value !== undefined ? client_discount_value : 5;
+    const commType = commission_type === "flat" ? "flat" : "percent";
+    const commPct = commission_pct !== undefined ? commission_pct : 10;
 
     // Generate unique agent code
     let agentCode = generateAgentCode();
@@ -99,22 +111,23 @@ router.post("/api/v1/admin/agents", requireAdmin, async (req, res) => {
       attempts++;
     }
 
-    // Create the linked discount code (5% off service fees)
+    // Create the linked discount code (client discount off service fees;
+    // referral_pct mirrors the agent commission for reporting).
     const dcResult = await pool.query(
       `INSERT INTO discount_codes (code, description, discount_type, discount_value, referral_partner, referral_email, referral_pct, active)
-       VALUES ($1, $2, 'percent', 5, $3, $4, 0, TRUE)
+       VALUES ($1, $2, 'percent', $3, $4, $5, $6, TRUE)
        RETURNING id`,
-      [agentCode, `Sales agent: ${name}`, name, email.toLowerCase().trim()],
+      [agentCode, `Sales agent: ${name}`, clientDiscount, name, email.toLowerCase().trim(), commType === "percent" ? commPct : 0],
     );
     const discountCodeId = dcResult.rows[0].id;
 
-    // Create the agent
+    // Create the agent (one row per referral code)
     const result = await pool.query(
-      `INSERT INTO sales_agents (agent_code, discount_code_id, name, email, phone, company, commission_default_cents, commission_pct, commission_overrides, notes, onboarded_at)
-       VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, now())
+      `INSERT INTO sales_agents (agent_code, discount_code_id, name, email, phone, company, commission_type, commission_default_cents, commission_pct, commission_overrides, notes, onboarded_at)
+       VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, now())
        RETURNING id, agent_code`,
       [agentCode, discountCodeId, name, email.toLowerCase().trim(), phone || null, company || null,
-       commission_default_cents || 30000, commission_pct || 10,
+       commType, commission_default_cents || 30000, commPct,
        JSON.stringify(commission_overrides || {}), notes || null],
     );
 
@@ -123,8 +136,14 @@ router.post("/api/v1/admin/agents", requireAdmin, async (req, res) => {
       success: true,
       agent_id: agent.id,
       agent_code: agent.agent_code,
+      client_discount_value: clientDiscount,
+      commission_type: commType,
+      commission_pct: commType === "percent" ? commPct : undefined,
+      existing_codes_for_email: existingCodes,
       referral_url: `https://performancewest.net/order/canada-crtc?code=${agent.agent_code}`,
-      message: `Agent created. Referral code: ${agent.agent_code}. Client gets 5% off, agent earns commission per sale.`,
+      message: existingCodes.length > 0
+        ? `Additional referral code created for ${email}. New code: ${agent.agent_code} (${clientDiscount}% client discount${commType === "percent" ? `, ${commPct}% commission` : ""}). This agent now has ${existingCodes.length + 1} codes.`
+        : `Agent created. Referral code: ${agent.agent_code}. Client gets ${clientDiscount}% off, agent earns commission per sale.`,
     });
   } catch (err) {
     console.error("[agents] Create error:", err);