Lego/feat/coupons (#317)

## Summary 
- Define Coupons table with its dependence on Event and with its
relation with Tickets
- include query/filter on Events for tickets with coupons.

Author: joseglego

drizzle/migrations/0037_condemned_red_hulk.sql

@@ -0,0 +1,27 @@
+CREATE TABLE IF NOT EXISTS "coupons" (
+	"id" uuid PRIMARY KEY DEFAULT gen_random_uuid() NOT NULL,
+	"name" text NOT NULL,
+	"coupon" text NOT NULL,
+	"description" text,
+	"event_id" uuid NOT NULL,
+	"is_active" boolean DEFAULT false NOT NULL,
+	"created_at" timestamp (6) DEFAULT now() NOT NULL,
+	"updated_at" timestamp (6),
+	"deleted_at" timestamp (6)
+);
+--> statement-breakpoint
+ALTER TABLE "tickets" ADD COLUMN "coupon_id" uuid;--> statement-breakpoint
+DO $$ BEGIN
+ ALTER TABLE "coupons" ADD CONSTRAINT "coupons_event_id_events_id_fk" FOREIGN KEY ("event_id") REFERENCES "public"."events"("id") ON DELETE no action ON UPDATE no action;
+EXCEPTION
+ WHEN duplicate_object THEN null;
+END $$;
+--> statement-breakpoint
+CREATE INDEX IF NOT EXISTS "coupons_event_id_index" ON "coupons" USING btree ("event_id");--> statement-breakpoint
+CREATE INDEX IF NOT EXISTS "coupons_code_index" ON "coupons" USING btree ("coupon");--> statement-breakpoint
+CREATE UNIQUE INDEX IF NOT EXISTS "coupons_event_code_unique_index" ON "coupons" USING btree ("event_id","coupon");--> statement-breakpoint
+DO $$ BEGIN
+ ALTER TABLE "tickets" ADD CONSTRAINT "tickets_coupon_id_coupons_id_fk" FOREIGN KEY ("coupon_id") REFERENCES "public"."coupons"("id") ON DELETE no action ON UPDATE no action;
+EXCEPTION
+ WHEN duplicate_object THEN null;
+END $$;