fixes and tweaks

Lutra/Lutra.Infrastructure/LutraDbContextFactory.cs

@@ -1,20 +1,58 @@
 using Microsoft.EntityFrameworkCore;
 using Microsoft.EntityFrameworkCore.Design;
+using Microsoft.Extensions.Configuration;
 
 namespace Lutra.Infrastructure.Sql;
 
 /// <summary>
 /// Design-time factory used by EF Core tools (dotnet ef migrations) so that
 /// no startup project or live database connection is required when running migrations.
+/// Reads ConnectionStrings:LutraDb from the API project's appsettings.json.
 /// </summary>
 internal sealed class LutraDbContextFactory : IDesignTimeDbContextFactory<LutraDbContext>
 {
+    private const string ConnectionStringName = "LutraDb";
+    private const string ConnectionStringEnvironmentVariableName = "ConnectionStrings__LutraDb";
+
     public LutraDbContext CreateDbContext(string[] args)
     {
+        var apiProjectPath = GetApiProjectPath();
+
+        var configuration = new ConfigurationBuilder()
+            .SetBasePath(apiProjectPath)
+            .AddJsonFile("appsettings.json", optional: false)
+            .AddJsonFile("appsettings.Development.json", optional: true)
+            .AddEnvironmentVariables()
+            .Build();
+
+        var connectionString = configuration.GetConnectionString(ConnectionStringName);
+        if (string.IsNullOrWhiteSpace(connectionString) || connectionString.Contains("<set-locally>", StringComparison.Ordinal))
+        {
+            throw new InvalidOperationException($"ConnectionStrings:{ConnectionStringName} is not configured. Set it in appsettings.Development.json or via {ConnectionStringEnvironmentVariableName}.");
+        }
+
         var options = new DbContextOptionsBuilder<LutraDbContext>()
-            .UseNpgsql("Host=localhost;Database=lutra;Username=postgres;Password=postgres")
+            .UseNpgsql(connectionString)
             .Options;
 
         return new LutraDbContext(options);
     }
+
+    private static string GetApiProjectPath()
+    {
+        var currentDirectory = new DirectoryInfo(Directory.GetCurrentDirectory());
+
+        while (currentDirectory is not null)
+        {
+            var apiProjectPath = Path.Combine(currentDirectory.FullName, "Lutra.API");
+            if (Directory.Exists(apiProjectPath))
+            {
+                return apiProjectPath;
+            }
+
+            currentDirectory = currentDirectory.Parent;
+        }
+
+        throw new InvalidOperationException("Could not locate the Lutra.API project directory.");
+    }
 }