feat(market-index): store MOEX index closes with confirmed coverage (WealthLedger/main#54)

prisma/migrations/20261107214500_add_market_index_history/migration.sql

@@ -0,0 +1,15 @@
+CREATE TABLE "MarketIndexDailyClose" (
+    "secid" TEXT NOT NULL,
+    "tradeDate" TEXT NOT NULL,
+    "close" TEXT NOT NULL,
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    CONSTRAINT "MarketIndexDailyClose_pkey" PRIMARY KEY ("secid","tradeDate")
+);
+
+CREATE TABLE "MarketIndexSyncState" (
+    "secid" TEXT NOT NULL PRIMARY KEY,
+    "lastAttemptAt" DATETIME,
+    "lastSuccessAt" DATETIME,
+    "coveredFrom" TEXT,
+    "coveredTo" TEXT
+);

prisma/schema.prisma

@@ -8,6 +8,24 @@ datasource db {
   provider = "sqlite"
 }
 
+// Public MOEX index closes contain no user holdings or credentials.
+model MarketIndexDailyClose {
+  secid     String
+  tradeDate String
+  close     String
+  createdAt DateTime @default(now())
+
+  @@id([secid, tradeDate])
+}
+
+model MarketIndexSyncState {
+  secid         String @id
+  lastAttemptAt DateTime?
+  lastSuccessAt DateTime?
+  coveredFrom   String?
+  coveredTo     String?
+}
+
 model User {
   id              String           @id
   email           String           @unique