Add further support for clicks counter

cmd/calls/articles.go

@@ -50,6 +50,17 @@ func ServeArticle(c *b.Config, db *b.DB) http.HandlerFunc {
 			return
 		}
 
-		fmt.Fprint(w, content)
+		article.Clicks++
+		if err = db.UpdateAttributes(&b.Attribute{Table: "articles", ID: article.ID, AttName: "clicks", Value: article.Clicks}); err != nil {
+			log.Println(err)
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+
+		if _, err = fmt.Fprint(w, content); err != nil {
+			log.Println(err)
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
 	}
 }

create_db.sql

@@ -35,6 +35,7 @@ CREATE TABLE articles (
     creator_id INT NOT NULL,
     issue_id INT NOT NULL,
     edited_id INT,
+    clicks INT NOT NULL,
     is_in_issue BOOL NOT NULL,
     auto_generated BOOL NOT NULL,
     PRIMARY KEY (id),