Database migration, repository, controller and service

Migrations/20261009132858_Init.cs

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+using System;
+using Microsoft.EntityFrameworkCore.Metadata;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace PaperlessAI.Migrations
+{
+    /// <inheritdoc />
+    public partial class Init : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AlterDatabase()
+                .Annotation("MySql:CharSet", "utf8mb4");
+
+            migrationBuilder.CreateTable(
+                name: "PaperlessDocuments",
+                columns: table => new
+                {
+                    Id = table.Column<long>(type: "bigint", nullable: false)
+                        .Annotation("MySql:ValueGenerationStrategy", MySqlValueGenerationStrategy.IdentityColumn),
+                    DocumentId = table.Column<long>(type: "bigint", nullable: false),
+                    DocumentState = table.Column<int>(type: "int", nullable: false),
+                    CreatedAt = table.Column<DateTimeOffset>(type: "datetime(6)", nullable: false),
+                    ModifiedAt = table.Column<DateTimeOffset>(type: "datetime(6)", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_PaperlessDocuments", x => x.Id);
+                })
+                .Annotation("MySql:CharSet", "utf8mb4")
+                .Annotation("Relational:Collation", "utf8mb4_uca1400_ai_ci");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_PaperlessDocuments_DocumentId",
+                table: "PaperlessDocuments",
+                column: "DocumentId",
+                unique: true);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "PaperlessDocuments");
+        }
+    }
+}