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diff --git a/guix-data-service/model/location.scm b/guix-data-service/model/location.scm
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+;;; Guix Data Service -- Information about Guix over time
+;;; Copyright © 2019 Christopher Baines <mail@cbaines.net>
+;;;
+;;; This program is free software: you can redistribute it and/or
+;;; modify it under the terms of the GNU Affero General Public License
+;;; as published by the Free Software Foundation, either version 3 of
+;;; the License, or (at your option) any later version.
+;;;
+;;; This program is distributed in the hope that it will be useful,
+;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;;; Affero General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU Affero General Public
+;;; License along with this program.  If not, see
+;;; <http://www.gnu.org/licenses/>.
+
+(define-module (guix-data-service model location)
+  #:use-module (ice-9 match)
+  #:use-module (guix utils)
+  #:use-module (squee)
+  #:export (location->location-id))
+
+(define select-existing-location
+  (string-append
+   "SELECT id "
+   "FROM locations "
+   "WHERE file = $1 AND line = $2 AND column_number = $3"))
+
+(define insert-location
+  (string-append
+   "INSERT INTO locations "
+   "(file, line, column_number) VALUES "
+   "($1, $2, $3) "
+   "RETURNING id"))
+
+(define (location->location-id conn location)
+  (match location
+    (($ <location> file line column)
+     (match (exec-query conn
+                        select-existing-location
+                        (list file
+                              (number->string line)
+                              (number->string column)))
+       (((id))
+        (string->number id))
+       (()
+        (string->number
+         (caar
+          (exec-query conn
+                      insert-location
+                      (list file
+                            (number->string line)
+                            (number->string column))))))))))