Implement WinRate, Bankroll, Positions UI and add Trades30d to Analytics

src/Predictalytics.Infrastructure/Data/Repositories/TraderRepository.cs

@@ -155,4 +155,14 @@ public class TraderRepository : ITraderRepository
             .Take(take)
             .ToListAsync(ct);
     }
+
+    public async Task<IReadOnlyList<TraderPosition>> GetPositionsAsync(int traderId, CancellationToken ct = default)
+    {
+        return await _db.TraderPositions
+            .Include(p => p.MarketOutcome)
+            .ThenInclude(o => o.Market)
+            .Where(p => p.TraderId == traderId && (p.SharesHeld > 0 || p.RealizedPnl != 0))
+            .OrderByDescending(p => p.LastTradeExecutedAt ?? DateTime.MinValue)
+            .ToListAsync(ct);
+    }
 }

src/Predictalytics.Infrastructure/Migrations/20260709095847_AddTrades30dToAnalytics.cs

@@ -0,0 +1,29 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Predictalytics.Infrastructure.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddTrades30dToAnalytics : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<int>(
+                name: "Trades30d",
+                table: "TraderAnalytics",
+                type: "int",
+                nullable: false,
+                defaultValue: 0);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "Trades30d",
+                table: "TraderAnalytics");
+        }
+    }
+}

src/Predictalytics.Infrastructure/Migrations/AppDbContextModelSnapshot.cs

@@ -667,6 +667,9 @@ namespace Predictalytics.Infrastructure.Migrations
                         .HasPrecision(18, 4)
                         .HasColumnType("decimal(18,4)");
 
+                    b.Property<int>("Trades30d")
+                        .HasColumnType("int");
+
                     b.Property<decimal>("WinRate24h")
                         .HasPrecision(8, 4)
                         .HasColumnType("decimal(8,4)");

src/Predictalytics.Infrastructure/Services/PositionPnLEngine.cs

@@ -321,6 +321,9 @@ public class PositionPnLEngine : IPositionPnLEngine
         analytics.PnL7d = overallPnl - (snapshot7d?.TotalPnl ?? 0);
         analytics.PnL30d = overallPnl - (snapshot30d?.TotalPnl ?? 0);
 
+        // Count Trades30d
+        analytics.Trades30d = trades.Count(t => t.ExecutedAt >= cutoff30d);
+
         // Calculate Win Rate on Market level
         var (winRateOverall, winRate30d, winRate7d, winRate24h) = CalculateMarketWinRates(trades, tempPositions, cutoff30d, cutoff7d, cutoff24h);