Move DB queries related to 'annotations' in a separate module

src/invidious/database/annotations.cr

@@ -0,0 +1,24 @@
+require "./base.cr"
+
+module Invidious::Database::Annotations
+  extend self
+
+  def insert(id : String, annotations : String)
+    request = <<-SQL
+      INSERT INTO annotations
+      VALUES ($1, $2)
+      ON CONFLICT DO NOTHING
+    SQL
+
+    PG_DB.exec(request, id, annotations)
+  end
+
+  def select(id : String) : Annotation?
+    request = <<-SQL
+      SELECT * FROM annotations
+      WHERE id = $1
+    SQL
+
+    return PG_DB.query_one?(request, id, as: Annotation)
+  end
+end