db: add migrations

migrations/20241017215433_create_event_table.postgres.down.sql

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+DROP TABLE "event"

migrations/20241017215433_create_event_table.postgres.up.sql

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+CREATE TABLE "event" (
+  "id" serial NOT NULL,
+  PRIMARY KEY ("id"),
+  "name" character varying(255) NOT NULL,
+  "description" character varying(10000) NULL,
+  "default_currency" character varying(255) NOT NULL,
+  "owner_id" integer NOT NULL,
+  "created_at" date NOT NULL,
+  "updated_at" date NOT NULL
+);

migrations/20241017215923_create_participation_table.postgres.down.sql

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+DROP TABLE participation;

migrations/20241017215923_create_participation_table.postgres.up.sql

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+CREATE TABLE "participation" (
+  "id" serial NOT NULL,
+  PRIMARY KEY ("id"),
+  "user_id" integer NOT NULL,
+  "event_id" integer NOT NULL,
+  "invited_by_user_id" integer NULL,
+  "created_at" date NOT NULL,
+  "updated_at" date NOT NULL
+);
+
+ALTER TABLE "participation"
+ADD FOREIGN KEY ("event_id") REFERENCES "event" ("id") ON DELETE CASCADE ON UPDATE CASCADE;
+
+ALTER TABLE "participation"
+ADD FOREIGN KEY ("user_id") REFERENCES "user" ("id") ON DELETE CASCADE ON UPDATE CASCADE;
+

migrations/20241017220309_event_add_total_amount.postgres.up.sql

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+ALTER TABLE "event"
+ADD "total_amount" integer NULL;