feat(api): split api into multiple apps (#1626)

Fixes #1622

- split the api into 4 apps: core, history, schedule, storage
- exploded the settings into testing/prod

api/libretime_api/schedule/models/schedule.py

@@ -0,0 +1,83 @@
+from django.db import models
+
+
+class Schedule(models.Model):
+    starts = models.DateTimeField()
+    ends = models.DateTimeField()
+    file = models.ForeignKey("storage.File", models.DO_NOTHING, blank=True, null=True)
+    stream = models.ForeignKey("Webstream", models.DO_NOTHING, blank=True, null=True)
+    clip_length = models.DurationField(blank=True, null=True)
+    fade_in = models.TimeField(blank=True, null=True)
+    fade_out = models.TimeField(blank=True, null=True)
+    cue_in = models.DurationField()
+    cue_out = models.DurationField()
+    media_item_played = models.BooleanField(blank=True, null=True)
+    instance = models.ForeignKey("ShowInstance", models.DO_NOTHING)
+    playout_status = models.SmallIntegerField()
+    broadcasted = models.SmallIntegerField()
+    position = models.IntegerField()
+
+    def get_owner(self):
+        return self.instance.get_owner()
+
+    def get_cueout(self):
+        """
+        Returns a scheduled item cueout that is based on the current show instance.
+
+        Cueout of a specific item can potentially overrun the show that it is
+        scheduled in. In that case, the cueout should be the end of the show.
+        This prevents the next show having overlapping items playing.
+
+        Cases:
+        - When the schedule ends before the end of the show instance,
+        return the stored cueout.
+
+        - When the schedule starts before the end of the show instance
+        and ends after the show instance ends,
+        return timedelta between schedule starts and show instance ends.
+
+        - When the schedule starts after the end of the show instance,
+        return the stored cue_out even if the schedule WILL NOT BE PLAYED.
+        """
+        if self.starts < self.instance.ends and self.instance.ends < self.ends:
+            return self.instance.ends - self.starts
+        return self.cue_out
+
+    def get_ends(self):
+        """
+        Returns a scheduled item ends that is based on the current show instance.
+
+        End of a specific item can potentially overrun the show that it is
+        scheduled in. In that case, the end should be the end of the show.
+        This prevents the next show having overlapping items playing.
+
+        Cases:
+        - When the schedule ends before the end of the show instance,
+        return the scheduled item ends.
+
+        - When the schedule starts before the end of the show instance
+        and ends after the show instance ends,
+        return the show instance ends.
+
+        - When the schedule starts after the end of the show instance,
+        return the show instance ends.
+        """
+        if self.instance.ends < self.ends:
+            return self.instance.ends
+        return self.ends
+
+    @property
+    def is_valid(self):
+        """
+        A schedule item is valid if it starts before the end of the show instance
+        it is in
+        """
+        return self.starts < self.instance.ends
+
+    class Meta:
+        managed = False
+        db_table = "cc_schedule"
+        permissions = [
+            ("change_own_schedule", "Change the content on their shows"),
+            ("delete_own_schedule", "Delete the content on their shows"),
+        ]