add balance to accounts

close #11

db/migrations/1734209196692-Data.js

-module.exports = class Data1730814071971 {
-    name = 'Data1730814071971'
+module.exports = class Data1734209196692 {
+    name = 'Data1734209196692'
 
     async up(db) {
         await db.query(`CREATE TABLE "event" ("id" character varying NOT NULL, "index" integer NOT NULL, "phase" text NOT NULL, "pallet" text NOT NULL, "name" text NOT NULL, "args" jsonb, "args_str" text array, "block_id" character varying, "extrinsic_id" character varying, "call_id" character varying, CONSTRAINT "PK_30c2f3bbaf6d34a55f8ae6e4614" PRIMARY KEY ("id"))`)
@@ -79,7 +79,7 @@ module.exports = class Data1730814071971 {
         await db.query(`CREATE INDEX "IDX_f4007436c1b546ede08a4fd7ab" ON "transfer" ("amount") `)
         await db.query(`CREATE INDEX "IDX_2a4e1dce9f72514cd28f554ee2" ON "transfer" ("event_id") `)
         await db.query(`CREATE INDEX "IDX_76cf30dd4464ed95ad44c5bb61" ON "transfer" ("comment_id") `)
-        await db.query(`CREATE TABLE "account" ("id" character varying NOT NULL, "created_on" integer NOT NULL, "is_active" boolean NOT NULL, "linked_identity_id" character varying, CONSTRAINT "PK_54115ee388cdb6d86bb4bf5b2ea" PRIMARY KEY ("id"))`)
+        await db.query(`CREATE TABLE "account" ("id" character varying NOT NULL, "created_on" integer NOT NULL, "is_active" boolean NOT NULL, "balance" numeric NOT NULL, "linked_identity_id" character varying, CONSTRAINT "PK_54115ee388cdb6d86bb4bf5b2ea" PRIMARY KEY ("id"))`)
         await db.query(`CREATE INDEX "IDX_73d14d249a6dcf9abe42eaa657" ON "account" ("linked_identity_id") `)
         await db.query(`CREATE TABLE "validator" ("id" character varying NOT NULL, "index" integer NOT NULL, CONSTRAINT "PK_ae0a943022c24bd60e7161e0fad" PRIMARY KEY ("id"))`)
         await db.query(`CREATE INDEX "IDX_49842e345355a71ff691c7a1ee" ON "validator" ("index") `)