Add interstitial endpoints and enhance media and template functionalities: implement MapInterstitialEndpoints in Program.cs, add preview functionality for media assets in MediaEndpoints, and introduce template preview capabilities in TemplateEndpoints. Remove obsolete bumper settings from Channel and related classes to streamline configuration.

backend/src/TeleWave.Infrastructure/Migrations/20260726105315_DropDeadBumperSettings.cs

@@ -0,0 +1,68 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace TeleWave.Infrastructure.Migrations
+{
+    /// <inheritdoc />
+    public partial class DropDeadBumperSettings : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            // Значение 0 (прежняя «ротация») из перечисления убрано: курсора ротации больше нет,
+            // и выбор молча вырождался в случайный. Переводим такие каналы на выбор по весам.
+            migrationBuilder.Sql(
+                """UPDATE "Channels" SET "BumperSelection" = 3 WHERE "BumperSelection" = 0;"""
+            );
+
+            migrationBuilder.DropColumn(
+                name: "BumperEpisodeChangeChance",
+                table: "Channels");
+
+            migrationBuilder.DropColumn(
+                name: "BumperMinIntervalMinutes",
+                table: "Channels");
+
+            migrationBuilder.DropColumn(
+                name: "BumperShowChangeChance",
+                table: "Channels");
+
+            migrationBuilder.DropColumn(
+                name: "NextBumperIndex",
+                table: "Channels");
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<double>(
+                name: "BumperEpisodeChangeChance",
+                table: "Channels",
+                type: "double precision",
+                nullable: false,
+                defaultValue: 0.0);
+
+            migrationBuilder.AddColumn<int>(
+                name: "BumperMinIntervalMinutes",
+                table: "Channels",
+                type: "integer",
+                nullable: false,
+                defaultValue: 0);
+
+            migrationBuilder.AddColumn<double>(
+                name: "BumperShowChangeChance",
+                table: "Channels",
+                type: "double precision",
+                nullable: false,
+                defaultValue: 0.0);
+
+            migrationBuilder.AddColumn<int>(
+                name: "NextBumperIndex",
+                table: "Channels",
+                type: "integer",
+                nullable: false,
+                defaultValue: 0);
+        }
+    }
+}

backend/src/TeleWave.Infrastructure/Migrations/AppDbContextModelSnapshot.cs

@@ -318,21 +318,12 @@ namespace TeleWave.Infrastructure.Migrations
                     b.Property<Guid>("Id")
                         .HasColumnType("uuid");
 
-                    b.Property<double>("BumperEpisodeChangeChance")
-                        .HasColumnType("double precision");
-
                     b.Property<int>("BumperFont")
                         .HasColumnType("integer");
 
-                    b.Property<int>("BumperMinIntervalMinutes")
-                        .HasColumnType("integer");
-
                     b.Property<int>("BumperSelection")
                         .HasColumnType("integer");
 
-                    b.Property<double>("BumperShowChangeChance")
-                        .HasColumnType("double precision");
-
                     b.Property<bool>("BumpersEnabled")
                         .HasColumnType("boolean");
 
@@ -356,9 +347,6 @@ namespace TeleWave.Infrastructure.Migrations
                         .HasMaxLength(256)
                         .HasColumnType("character varying(256)");
 
-                    b.Property<int>("NextBumperIndex")
-                        .HasColumnType("integer");
-
                     b.Property<int?>("Number")
                         .HasColumnType("integer");