fix migration script for epic account

ScriptsDB/20231101-01- add epic support.sql

@@ -1,7 +1,7 @@
-CREATE TABLE IF NOT EXISTS "epic_id_mapping" (
-	"epic_id"	varchar(64) NOT NULL,
-    "user_id" integer NOT NULL,
-	"last_login" integer NOT NULL,
-	CONSTRAINT "fk_epic_id_mapping" FOREIGN KEY("user_id") REFERENCES "users"("id") ON DELETE CASCADE ON UPDATE CASCADE,
-	CREATE UNIQUE INDEX epic_id_mapping_idx ON data(epic_id, user_id);
+CREATE TABLE IF NOT EXISTS epic_id_mapping (
+    epic_id varchar(64) NOT NULL,
+    user_id integer NOT NULL,
+    last_login integer NOT NULL,
+    CONSTRAINT fk_epic_id_mapping FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE ON UPDATE CASCADE,
+    CONSTRAINT unique_epic_user_id UNIQUE (epic_id, user_id)
 );