Add Prisma schema, .env, and initial migration for trading bot database

prisma/schema.prisma

@@ -0,0 +1,114 @@
+generator client {
+  provider = "prisma-client-js"
+}
+
+datasource db {
+  provider = "sqlite"
+  url      = env("DATABASE_URL")
+}
+
+model User {
+  id        String           @id @default(cuid())
+  email     String           @unique
+  name      String?
+  createdAt DateTime         @default(now())
+  updatedAt DateTime         @updatedAt
+  apiKeys   ApiKey[]
+  trades    Trade[]
+  journals  TradingJournal[]
+  settings  UserSettings?
+
+  @@map("users")
+}
+
+model ApiKey {
+  id           String   @id @default(cuid())
+  userId       String
+  provider     String
+  keyName      String
+  encryptedKey String
+  isActive     Boolean  @default(true)
+  createdAt    DateTime @default(now())
+  updatedAt    DateTime @updatedAt
+  user         User     @relation(fields: [userId], references: [id], onDelete: Cascade)
+
+  @@unique([userId, provider, keyName])
+  @@map("api_keys")
+}
+
+model UserSettings {
+  id                  String   @id @default(cuid())
+  userId              String   @unique
+  autoTrading         Boolean  @default(false)
+  tradingAmount       Float    @default(100)
+  riskPercentage      Float    @default(2)
+  maxDailyTrades      Int      @default(5)
+  enableNotifications Boolean  @default(true)
+  createdAt           DateTime @default(now())
+  updatedAt           DateTime @updatedAt
+  user                User     @relation(fields: [userId], references: [id], onDelete: Cascade)
+
+  @@map("user_settings")
+}
+
+model Trade {
+  id            String    @id @default(cuid())
+  userId        String
+  symbol        String
+  side          String
+  amount        Float
+  price         Float
+  status        String    @default("PENDING")
+  driftTxId     String?
+  profit        Float?
+  fees          Float?
+  screenshotUrl String?
+  aiAnalysis    String?
+  createdAt     DateTime  @default(now())
+  updatedAt     DateTime  @updatedAt
+  executedAt    DateTime?
+  closedAt      DateTime?
+  user          User      @relation(fields: [userId], references: [id], onDelete: Cascade)
+
+  @@map("trades")
+}
+
+model TradingJournal {
+  id              String   @id @default(cuid())
+  userId          String
+  date            DateTime @default(now())
+  screenshotUrl   String
+  aiAnalysis      String
+  marketSentiment String?
+  keyLevels       Json?
+  recommendation  String
+  confidence      Float
+  notes           String?
+  createdAt       DateTime @default(now())
+  updatedAt       DateTime @updatedAt
+  user            User     @relation(fields: [userId], references: [id], onDelete: Cascade)
+
+  @@map("trading_journals")
+}
+
+model Screenshot {
+  id        String   @id @default(cuid())
+  url       String
+  filename  String
+  fileSize  Int
+  mimeType  String
+  metadata  Json?
+  createdAt DateTime @default(now())
+
+  @@map("screenshots")
+}
+
+model SystemLog {
+  id        String   @id @default(cuid())
+  level     String
+  message   String
+  metadata  Json?
+  createdAt DateTime @default(now())
+
+  @@map("system_logs")
+}