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

src/invidious/database/base.cr

@@ -0,0 +1,4 @@
+require "pg"
+
+module Invidious::Database
+end

src/invidious/database/videos.cr

@@ -0,0 +1,43 @@
+require "./base.cr"
+
+module Invidious::Database::Videos
+  extend self
+
+  def insert(video : Video)
+    request = <<-SQL
+      INSERT INTO videos
+      VALUES ($1, $2, $3)
+      ON CONFLICT (id) DO NOTHING
+    SQL
+
+    PG_DB.exec(request, video.id, video.info.to_json, video.updated)
+  end
+
+  def delete(id)
+    request = <<-SQL
+      DELETE FROM videos *
+      WHERE id = $1
+    SQL
+
+    PG_DB.exec(request, id)
+  end
+
+  def update(video : Video)
+    request = <<-SQL
+      UPDATE videos
+      SET (id, info, updated) = ($1, $2, $3)
+      WHERE id = $1
+    SQL
+
+    PG_DB.exec(request, video.id, video.info.to_json, video.updated)
+  end
+
+  def select(id : String) : Video?
+    request = <<-SQL
+      SELECT * FROM videos
+      WHERE id = $1
+    SQL
+
+    return PG_DB.query_one?(request, id, as: Video)
+  end
+end