[codex] Update finance dashboard currency analysis

Data/FinanceDbContext.cs

@@ -11,17 +11,23 @@ public FinanceDbContext(DbContextOptions<FinanceDbContext> options) : base(optio
 
     public DbSet<Transaction> Transactions => Set<Transaction>();
 
+    public DbSet<SavingsInvestment> SavingsInvestments => Set<SavingsInvestment>();
+
     protected override void OnModelCreating(ModelBuilder modelBuilder)
     {
         base.OnModelCreating(modelBuilder);
 
         modelBuilder.Entity<Transaction>().Property(transaction => transaction.Amount).HasColumnType("decimal(18,2)");
+        modelBuilder.Entity<Transaction>().Property(transaction => transaction.Currency).HasMaxLength(3).HasDefaultValue("USD");
+        modelBuilder.Entity<SavingsInvestment>().Property(investment => investment.Amount).HasColumnType("decimal(18,2)");
+        modelBuilder.Entity<SavingsInvestment>().Property(investment => investment.Currency).HasMaxLength(3).HasDefaultValue("USD");
+        modelBuilder.Entity<SavingsInvestment>().Property(investment => investment.CashImpactType).HasMaxLength(30).HasDefaultValue("ExistingAsset");
 
         var createdDate = new DateTime(2026, 6, 1, 0, 0, 0, DateTimeKind.Utc);
         modelBuilder.Entity<Transaction>().HasData(
-            new Transaction { Id = 1, Type = "Income", Amount = 3000, Category = "Salary", Date = new DateTime(2026, 6, 1), Notes = "Monthly salary", CreatedDate = createdDate },
-            new Transaction { Id = 2, Type = "Expense", Amount = 25, Category = "Food", Date = new DateTime(2026, 6, 2), Notes = "Lunch", CreatedDate = createdDate },
-            new Transaction { Id = 3, Type = "Expense", Amount = 100, Category = "Shopping", Date = new DateTime(2026, 6, 3), Notes = "Clothes", CreatedDate = createdDate }
+            new Transaction { Id = 1, Type = "Income", Amount = 3000, Currency = "USD", Category = "Salary", Date = new DateTime(2026, 6, 1), Notes = "Monthly salary", CreatedDate = createdDate },
+            new Transaction { Id = 2, Type = "Expense", Amount = 25, Currency = "USD", Category = "Food", Date = new DateTime(2026, 6, 2), Notes = "Lunch", CreatedDate = createdDate },
+            new Transaction { Id = 3, Type = "Expense", Amount = 100, Currency = "USD", Category = "Shopping", Date = new DateTime(2026, 6, 3), Notes = "Clothes", CreatedDate = createdDate }
         );
     }
 
@@ -35,6 +41,14 @@ public override Task<int> SaveChangesAsync(CancellationToken cancellationToken =
             }
         }
 
+        foreach (var entry in ChangeTracker.Entries<SavingsInvestment>())
+        {
+            if (entry.State == EntityState.Added)
+            {
+                entry.Entity.CreatedDate = DateTime.UtcNow;
+            }
+        }
+
         return base.SaveChangesAsync(cancellationToken);
     }
 }

Migrations/20260606003948_AddSavingsInvestments.cs

@@ -0,0 +1,40 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace FinanceProject.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddSavingsInvestments : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateTable(
+                name: "SavingsInvestments",
+                columns: table => new
+                {
+                    Id = table.Column<int>(type: "int", nullable: false)
+                        .Annotation("SqlServer:Identity", "1, 1"),
+                    InvestmentType = table.Column<string>(type: "nvarchar(max)", nullable: false),
+                    Name = table.Column<string>(type: "nvarchar(100)", maxLength: 100, nullable: false),
+                    Amount = table.Column<decimal>(type: "decimal(18,2)", nullable: false),
+                    Date = table.Column<DateTime>(type: "datetime2", nullable: false),
+                    Notes = table.Column<string>(type: "nvarchar(500)", maxLength: 500, nullable: true),
+                    CreatedDate = table.Column<DateTime>(type: "datetime2", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_SavingsInvestments", x => x.Id);
+                });
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "SavingsInvestments");
+        }
+    }
+}