IO-1612 Add employee vacation tracking.

hasura/migrations/1641339745427_create_table_public_employee_vacation/down.sql

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+DROP TABLE "public"."employee_vacation";

hasura/migrations/1641339745427_create_table_public_employee_vacation/up.sql

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+CREATE TABLE "public"."employee_vacation" ("id" uuid NOT NULL DEFAULT gen_random_uuid(), "created_at" timestamptz NOT NULL DEFAULT now(), "updated_at" timestamptz NOT NULL DEFAULT now(), "employeeid" uuid NOT NULL, "start" date NOT NULL, "end" date NOT NULL, PRIMARY KEY ("id") , FOREIGN KEY ("employeeid") REFERENCES "public"."employees"("id") ON UPDATE cascade ON DELETE cascade);
+CREATE OR REPLACE FUNCTION "public"."set_current_timestamp_updated_at"()
+RETURNS TRIGGER AS $$
+DECLARE
+  _new record;
+BEGIN
+  _new := NEW;
+  _new."updated_at" = NOW();
+  RETURN _new;
+END;
+$$ LANGUAGE plpgsql;
+CREATE TRIGGER "set_public_employee_vacation_updated_at"
+BEFORE UPDATE ON "public"."employee_vacation"
+FOR EACH ROW
+EXECUTE PROCEDURE "public"."set_current_timestamp_updated_at"();
+COMMENT ON TRIGGER "set_public_employee_vacation_updated_at" ON "public"."employee_vacation" 
+IS 'trigger to set value of column "updated_at" to current timestamp on row update';
+CREATE EXTENSION IF NOT EXISTS pgcrypto;