DNS backend

dns/migrations/004_add_domain_invite_codes.sql

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+-- Add domain_invite_codes field to users table
+ALTER TABLE users ADD COLUMN domain_invite_codes INTEGER DEFAULT 3;
+
+-- Create domain invite codes table for domain-specific invites
+CREATE TABLE IF NOT EXISTS domain_invite_codes (
+    id SERIAL PRIMARY KEY,
+    code VARCHAR(32) UNIQUE NOT NULL,
+    created_by INTEGER REFERENCES users(id),
+    used_by INTEGER REFERENCES users(id),
+    created_at TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP,
+    used_at TIMESTAMPTZ
+);
+
+-- Create indexes for faster lookups
+CREATE INDEX IF NOT EXISTS idx_domain_invite_codes_code ON domain_invite_codes(code);
+CREATE INDEX IF NOT EXISTS idx_domain_invite_codes_created_by ON domain_invite_codes(created_by);
+CREATE INDEX IF NOT EXISTS idx_domain_invite_codes_used_by ON domain_invite_codes(used_by);