Initial commit carried over from private repo. This is V2.

code/MessengerApi.Db.Npg/MessengerApi.Db.Npg.csproj

@@ -0,0 +1,17 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="9.0.4" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\MessengerApi.Db\MessengerApi.Db.csproj" />
+  </ItemGroup>
+
+</Project>

code/MessengerApi.Db.Npg/MessengerNpgDbContext.cs

@@ -0,0 +1,31 @@
+using MessengerApi.Db.Entities;
+using Microsoft.EntityFrameworkCore;
+
+namespace MessengerApi.Db.Npg
+{
+    public class MessengerNpgDbContext : MessengerDbContext
+    {
+        private readonly string connectionString;
+
+        public MessengerNpgDbContext(string connectionString)
+        {
+            this.connectionString = connectionString;
+        }
+
+        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
+        {
+            base.OnConfiguring(optionsBuilder);
+            optionsBuilder.UseNpgsql(this.connectionString);
+        }
+
+        protected override void OnModelCreating(ModelBuilder modelBuilder)
+        {
+            base.OnModelCreating(modelBuilder);
+
+            // https://stackoverflow.com/questions/26464357/what-is-the-purpose-of-non-unique-indexes-in-a-database
+            // https://stackoverflow.com/questions/40767980/generate-a-composite-unique-constraint-index-in-ef-core
+            // https://www.geeksforgeeks.org/difference-between-clustered-and-non-clustered-index/
+            modelBuilder.Entity<Message>().HasIndex(e => new { e.ToId, e.IsDelivered }).IsUnique(false);
+        }
+    }
+}

code/MessengerApi.Db.Npg/Migrations/20250704170425_Initial.Designer.cs

@@ -0,0 +1,123 @@
+// <auto-generated />
+using System;
+using MessengerApi.Db.Npg;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
+
+#nullable disable
+
+namespace MessengerApi.Db.Npg.Migrations
+{
+    [DbContext(typeof(MessengerNpgDbContext))]
+    [Migration("20250704170425_Initial")]
+    partial class Initial
+    {
+        /// <inheritdoc />
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "9.0.6")
+                .HasAnnotation("Relational:MaxIdentifierLength", 63);
+
+            NpgsqlModelBuilderExtensions.UseIdentityByDefaultColumns(modelBuilder);
+
+            modelBuilder.Entity("MessengerApi.Db.Entities.Message", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<DateTime>("CreatedUtc")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<Guid>("FromId")
+                        .HasColumnType("uuid");
+
+                    b.Property<bool>("IsAcknowledged")
+                        .HasColumnType("boolean");
+
+                    b.Property<bool>("IsDelivered")
+                        .HasColumnType("boolean");
+
+                    b.Property<string>("Payload")
+                        .HasColumnType("text");
+
+                    b.Property<int>("PayloadLifespanInSeconds")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("PayloadType")
+                        .HasColumnType("text");
+
+                    b.Property<Guid>("ToId")
+                        .HasColumnType("uuid");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("ToId", "IsDelivered");
+
+                    b.ToTable("Messages");
+                });
+
+            modelBuilder.Entity("MessengerApi.Db.Entities.User", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<Guid>("ApiKey")
+                        .HasColumnType("uuid");
+
+                    b.Property<bool>("IsEnabled")
+                        .HasColumnType("boolean");
+
+                    b.Property<string>("Name")
+                        .HasColumnType("text");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("Users");
+                });
+
+            modelBuilder.Entity("MessengerApi.Db.Entities.UserRoute", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<Guid?>("FromId")
+                        .HasColumnType("uuid");
+
+                    b.Property<Guid?>("ToId")
+                        .HasColumnType("uuid");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("FromId");
+
+                    b.HasIndex("ToId");
+
+                    b.ToTable("UserRoutes");
+                });
+
+            modelBuilder.Entity("MessengerApi.Db.Entities.UserRoute", b =>
+                {
+                    b.HasOne("MessengerApi.Db.Entities.User", "From")
+                        .WithMany()
+                        .HasForeignKey("FromId");
+
+                    b.HasOne("MessengerApi.Db.Entities.User", "To")
+                        .WithMany()
+                        .HasForeignKey("ToId");
+
+                    b.Navigation("From");
+
+                    b.Navigation("To");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}

code/MessengerApi.Db.Npg/Migrations/20250704170425_Initial.cs

@@ -0,0 +1,99 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace MessengerApi.Db.Npg.Migrations
+{
+    /// <inheritdoc />
+    public partial class Initial : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateTable(
+                name: "Messages",
+                columns: table => new
+                {
+                    Id = table.Column<Guid>(type: "uuid", nullable: false),
+                    CreatedUtc = table.Column<DateTime>(type: "timestamp with time zone", nullable: false),
+                    FromId = table.Column<Guid>(type: "uuid", nullable: false),
+                    ToId = table.Column<Guid>(type: "uuid", nullable: false),
+                    IsDelivered = table.Column<bool>(type: "boolean", nullable: false),
+                    IsAcknowledged = table.Column<bool>(type: "boolean", nullable: false),
+                    PayloadType = table.Column<string>(type: "text", nullable: true),
+                    Payload = table.Column<string>(type: "text", nullable: true),
+                    PayloadLifespanInSeconds = table.Column<int>(type: "integer", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_Messages", x => x.Id);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "Users",
+                columns: table => new
+                {
+                    Id = table.Column<Guid>(type: "uuid", nullable: false),
+                    ApiKey = table.Column<Guid>(type: "uuid", nullable: false),
+                    Name = table.Column<string>(type: "text", nullable: true),
+                    IsEnabled = table.Column<bool>(type: "boolean", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_Users", x => x.Id);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "UserRoutes",
+                columns: table => new
+                {
+                    Id = table.Column<Guid>(type: "uuid", nullable: false),
+                    FromId = table.Column<Guid>(type: "uuid", nullable: true),
+                    ToId = table.Column<Guid>(type: "uuid", nullable: true)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_UserRoutes", x => x.Id);
+                    table.ForeignKey(
+                        name: "FK_UserRoutes_Users_FromId",
+                        column: x => x.FromId,
+                        principalTable: "Users",
+                        principalColumn: "Id");
+                    table.ForeignKey(
+                        name: "FK_UserRoutes_Users_ToId",
+                        column: x => x.ToId,
+                        principalTable: "Users",
+                        principalColumn: "Id");
+                });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Messages_ToId_IsDelivered",
+                table: "Messages",
+                columns: new[] { "ToId", "IsDelivered" });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_UserRoutes_FromId",
+                table: "UserRoutes",
+                column: "FromId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_UserRoutes_ToId",
+                table: "UserRoutes",
+                column: "ToId");
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "Messages");
+
+            migrationBuilder.DropTable(
+                name: "UserRoutes");
+
+            migrationBuilder.DropTable(
+                name: "Users");
+        }
+    }
+}

code/MessengerApi.Db.Npg/Migrations/MessengerNpgDbContextModelSnapshot.cs

@@ -0,0 +1,120 @@
+// <auto-generated />
+using System;
+using MessengerApi.Db.Npg;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
+
+#nullable disable
+
+namespace MessengerApi.Db.Npg.Migrations
+{
+    [DbContext(typeof(MessengerNpgDbContext))]
+    partial class MessengerNpgDbContextModelSnapshot : ModelSnapshot
+    {
+        protected override void BuildModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "9.0.6")
+                .HasAnnotation("Relational:MaxIdentifierLength", 63);
+
+            NpgsqlModelBuilderExtensions.UseIdentityByDefaultColumns(modelBuilder);
+
+            modelBuilder.Entity("MessengerApi.Db.Entities.Message", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<DateTime>("CreatedUtc")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<Guid>("FromId")
+                        .HasColumnType("uuid");
+
+                    b.Property<bool>("IsAcknowledged")
+                        .HasColumnType("boolean");
+
+                    b.Property<bool>("IsDelivered")
+                        .HasColumnType("boolean");
+
+                    b.Property<string>("Payload")
+                        .HasColumnType("text");
+
+                    b.Property<int>("PayloadLifespanInSeconds")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("PayloadType")
+                        .HasColumnType("text");
+
+                    b.Property<Guid>("ToId")
+                        .HasColumnType("uuid");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("ToId", "IsDelivered");
+
+                    b.ToTable("Messages");
+                });
+
+            modelBuilder.Entity("MessengerApi.Db.Entities.User", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<Guid>("ApiKey")
+                        .HasColumnType("uuid");
+
+                    b.Property<bool>("IsEnabled")
+                        .HasColumnType("boolean");
+
+                    b.Property<string>("Name")
+                        .HasColumnType("text");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("Users");
+                });
+
+            modelBuilder.Entity("MessengerApi.Db.Entities.UserRoute", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<Guid?>("FromId")
+                        .HasColumnType("uuid");
+
+                    b.Property<Guid?>("ToId")
+                        .HasColumnType("uuid");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("FromId");
+
+                    b.HasIndex("ToId");
+
+                    b.ToTable("UserRoutes");
+                });
+
+            modelBuilder.Entity("MessengerApi.Db.Entities.UserRoute", b =>
+                {
+                    b.HasOne("MessengerApi.Db.Entities.User", "From")
+                        .WithMany()
+                        .HasForeignKey("FromId");
+
+                    b.HasOne("MessengerApi.Db.Entities.User", "To")
+                        .WithMany()
+                        .HasForeignKey("ToId");
+
+                    b.Navigation("From");
+
+                    b.Navigation("To");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}