Ran the needful migrations for replacing channels with sources

priv/repo/migrations/20240202040724_rename_channel_and_related_fields.exs

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+defmodule Pinchflat.Repo.Migrations.RenameChannelAndRelatedFields do
+  use Ecto.Migration
+
+  def change do
+    # Creation
+    create table(:sources) do
+      add :name, :string, null: false
+      add :collection_type, :string, null: false
+      add :collection_id, :string, null: false
+      add :original_url, :string, null: false
+      add :media_profile_id, references(:media_profiles, on_delete: :restrict), null: false
+
+      timestamps(type: :utc_datetime)
+    end
+
+    alter table(:media_items) do
+      add :source_id, references(:sources, on_delete: :restrict), null: false
+    end
+
+    alter table(:tasks) do
+      # `restrict` because we need to be sure to delete pending tasks when a source is deleted
+      add :source_id, references(:sources, on_delete: :restrict), null: true
+    end
+
+    create index(:sources, [:media_profile_id])
+    create unique_index(:sources, [:collection_id, :media_profile_id])
+
+    create index(:media_items, [:source_id])
+    create unique_index(:media_items, [:media_id, :source_id])
+
+    # Deletion
+    drop index(:media_items, [:channel_id])
+    drop unique_index(:media_items, [:media_id, :channel_id])
+
+    alter table(:tasks) do
+      # `restrict` because we need to be sure to delete pending tasks when a source is deleted
+      remove :channel_id, references(:channels, on_delete: :restrict), null: true
+    end
+
+    alter table(:media_items) do
+      remove :channel_id, references(:channels, on_delete: :restrict), null: true
+    end
+  end
+end

priv/repo/migrations/20240202043042_drop_channels_table.exs

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+defmodule Pinchflat.Repo.Migrations.DropChannelsTable do
+  use Ecto.Migration
+
+  def up do
+    drop table(:channels)
+  end
+
+  def down do
+    create table(:channels) do
+      add :name, :string, null: false
+      add :channel_id, :string, null: false
+      add :original_url, :string, null: false
+      add :media_profile_id, references(:media_profiles, on_delete: :restrict), null: false
+
+      timestamps(type: :utc_datetime)
+    end
+
+    create index(:channels, [:media_profile_id])
+    create unique_index(:channels, [:channel_id, :media_profile_id])
+  end
+end