feat: implement per-symbol cooldown period

CRITICAL: Cooldown was global across ALL symbols, causing missed opportunities
Example: ETH trade at 10:00 blocked SOL trade at 10:04 (5min cooldown)

Changes:
- Added getLastTradeTimeForSymbol() function to query last trade per symbol
- Updated check-risk endpoint to use symbol-specific cooldown
- Each coin (SOL/ETH/BTC) now has independent cooldown timer
- Cooldown message shows symbol: 'Must wait X min before next SOL-PERP trade'

Result: Can trade ETH and SOL simultaneously without interference
Example: ETH LONG at 10:00, SOL SHORT at 10:01 = both allowed

app/api/trading/check-risk/route.ts

@@ -8,7 +8,7 @@
 import { NextRequest, NextResponse } from 'next/server'
 import { getMergedConfig } from '@/config/trading'
 import { getInitializedPositionManager } from '@/lib/trading/position-manager'
-import { getLastTradeTime, getTradesInLastHour, getTodayPnL } from '@/lib/database/trades'
+import { getLastTradeTime, getLastTradeTimeForSymbol, getTradesInLastHour, getTodayPnL } from '@/lib/database/trades'
 
 export interface RiskCheckRequest {
   symbol: string
@@ -118,18 +118,18 @@ export async function POST(request: NextRequest): Promise<NextResponse<RiskCheck
       })
     }
     
-    // 3. Check cooldown period
+    // 3. Check cooldown period PER SYMBOL (not global)
-    const lastTradeTime = await getLastTradeTime()
+    const lastTradeTimeForSymbol = await getLastTradeTimeForSymbol(body.symbol)
-    if (lastTradeTime && config.minTimeBetweenTrades > 0) {
+    if (lastTradeTimeForSymbol && config.minTimeBetweenTrades > 0) {
-      const timeSinceLastTrade = Date.now() - lastTradeTime.getTime()
+      const timeSinceLastTrade = Date.now() - lastTradeTimeForSymbol.getTime()
       const cooldownMs = config.minTimeBetweenTrades * 60 * 1000 // Convert minutes to milliseconds
       
       if (timeSinceLastTrade < cooldownMs) {
         const remainingMs = cooldownMs - timeSinceLastTrade
         const remainingMinutes = Math.ceil(remainingMs / 60000)
         
-        console.log('🚫 Risk check BLOCKED: Cooldown period active', {
+        console.log('🚫 Risk check BLOCKED: Cooldown period active for', body.symbol, {
-          lastTradeTime: lastTradeTime.toISOString(),
+          lastTradeTime: lastTradeTimeForSymbol.toISOString(),
           timeSinceLastTradeMs: timeSinceLastTrade,
           cooldownMs,
           remainingMinutes,
@@ -138,7 +138,7 @@ export async function POST(request: NextRequest): Promise<NextResponse<RiskCheck
         return NextResponse.json({
           allowed: false,
           reason: 'Cooldown period',
-          details: `Must wait ${remainingMinutes} more minute(s) before next trade (cooldown: ${config.minTimeBetweenTrades} min)`,
+          details: `Must wait ${remainingMinutes} more minute(s) before next ${body.symbol} trade (cooldown: ${config.minTimeBetweenTrades} min)`,
         })
       }
     }
@@ -175,7 +175,7 @@ export async function POST(request: NextRequest): Promise<NextResponse<RiskCheck
       console.log(`✅ Risk check PASSED: All checks passed`, {
         todayPnL: todayPnL.toFixed(2),
         tradesLastHour: tradesInLastHour,
-        cooldownPassed: lastTradeTime ? 'yes' : 'no previous trades',
+        cooldownPassed: lastTradeTimeForSymbol ? 'yes' : `no previous ${body.symbol} trades`,
         qualityScore: qualityScore.score,
         qualityReasons: qualityScore.reasons
       })
@@ -191,7 +191,7 @@ export async function POST(request: NextRequest): Promise<NextResponse<RiskCheck
     console.log(`✅ Risk check PASSED: All checks passed`, {
       todayPnL: todayPnL.toFixed(2),
       tradesLastHour: tradesInLastHour,
-      cooldownPassed: lastTradeTime ? 'yes' : 'no previous trades',
+      cooldownPassed: lastTradeTimeForSymbol ? 'yes' : `no previous ${body.symbol} trades`,
     })
     
     return NextResponse.json({

lib/database/trades.ts

@@ -276,6 +276,26 @@ export async function getLastTradeTime(): Promise<Date | null> {
   }
 }
 
+/**
+ * Get the most recent trade time for a specific symbol
+ */
+export async function getLastTradeTimeForSymbol(symbol: string): Promise<Date | null> {
+  const prisma = getPrismaClient()
+  
+  try {
+    const lastTrade = await prisma.trade.findFirst({
+      where: { symbol },
+      orderBy: { entryTime: 'desc' },
+      select: { entryTime: true },
+    })
+    
+    return lastTrade?.entryTime || null
+  } catch (error) {
+    console.error(`❌ Failed to get last trade time for ${symbol}:`, error)
+    return null
+  }
+}
+
 /**
  * Get the most recent trade with full details
  */