Add schedule sync and schedule-aware playback

tests/test_db.cpp

@@ -347,6 +347,54 @@ TEST(DatabaseManagerTest, SyncAudioFilesClearsEverythingWhenEmpty) {
     EXPECT_EQ(fx.db.getAudioFiles().size(), 0u);
 }
 
+TEST(DatabaseManagerTest, ReplaceAndReadScheduleBlocks) {
+    DbFixture fx("test_rw_db_schedule.db");
+
+    ScheduleBlockRecord morning;
+    morning.id = "b1";
+    morning.start_minutes = 360;
+    morning.end_minutes = 480;
+    morning.overnight = false;
+    morning.duration_minutes = 120;
+    morning.dynamic_audio = false;
+    morning.proclamation_ids = {"p2", "p1"};
+
+    ScheduleBlockRecord night;
+    night.id = "b2";
+    night.start_minutes = 1260;
+    night.end_minutes = 540;
+    night.overnight = true;
+    night.duration_minutes = 720;
+    night.dynamic_audio = true;
+    night.proclamation_ids = {"p3"};
+
+    ASSERT_TRUE(fx.db.replaceScheduleBlocks({morning, night}));
+
+    auto rows = fx.db.getScheduleBlocks();
+    ASSERT_EQ(rows.size(), 2u);
+
+    EXPECT_EQ(rows[0].id, "b1");
+    EXPECT_EQ(rows[0].start_minutes, 360);
+    EXPECT_EQ(rows[0].end_minutes, 480);
+    EXPECT_FALSE(rows[0].overnight);
+    EXPECT_EQ(rows[0].duration_minutes, 120);
+    EXPECT_FALSE(rows[0].dynamic_audio);
+    // Play order is preserved, not sorted.
+    ASSERT_EQ(rows[0].proclamation_ids.size(), 2u);
+    EXPECT_EQ(rows[0].proclamation_ids[0], "p2");
+    EXPECT_EQ(rows[0].proclamation_ids[1], "p1");
+
+    EXPECT_EQ(rows[1].id, "b2");
+    EXPECT_TRUE(rows[1].overnight);
+    EXPECT_TRUE(rows[1].dynamic_audio);
+    ASSERT_EQ(rows[1].proclamation_ids.size(), 1u);
+    EXPECT_EQ(rows[1].proclamation_ids[0], "p3");
+
+    // A re-sync replaces the whole schedule.
+    ASSERT_TRUE(fx.db.replaceScheduleBlocks({}));
+    EXPECT_EQ(fx.db.getScheduleBlocks().size(), 0u);
+}
+
 TEST(DatabaseManagerTest, PalettesSeededAndRead) {
     DbFixture fx("test_rw_db_palette.db");