diff --git a/db/migrate/20160207043305_add_foreign_key_constraints.rb b/db/migrate/20160207043305_add_foreign_key_constraints.rb
new file mode 100644
index 0000000..d5be66b
--- /dev/null
+++ b/db/migrate/20160207043305_add_foreign_key_constraints.rb
@@ -0,0 +1,25 @@
+class AddForeignKeyConstraints < ActiveRecord::Migration
+  def up
+    add_foreign_key :user_snps, :genotypes, column: :genotype_id # primary_key: defaults to :id so no need to add
+    add_foreign_key :genotypes, :users, column: :user_id
+    add_foreign_key :fitbit_profiles, :users, column: :user_id
+    add_foreign_key :homepages, :users, column: :user_id
+    add_foreign_key :user_phenotypes, :users, column: :user_id
+    add_foreign_key :user_picture_phenotypes, :users, column: :user_id
+    add_foreign_key :phenotype_comments, :users, column: :user_id
+    add_foreign_key :picture_phenotype_comments, :users, column: :user_id
+    add_foreign_key :user_achievements, :users, column: :user_id
+  end
+
+  def down
+    remove_foreign_key :user_snps, :genotypes
+    remove_foreign_key :genotypes, :users
+    remove_foreign_key :fitbit_profiles, :users
+    remove_foreign_key :homepages, :users
+    remove_foreign_key :user_phenotypes, :users
+    remove_foreign_key :user_picture_phenotypes, :users
+    remove_foreign_key :phenotype_comments, :users
+    remove_foreign_key :picture_phenotype_comments, :users
+    remove_foreign_key :user_achievements, :users
+  end
+end
diff --git a/db/structure.sql b/db/structure.sql
index a94e48c..602d11f 100644
--- a/db/structure.sql
+++ b/db/structure.sql
@@ -1829,6 +1829,14 @@ ALTER TABLE ONLY user_picture_phenotypes
     ADD CONSTRAINT fk_rails_474a80b46d FOREIGN KEY (user_id) REFERENCES users(id);
 
 
+--
+-- Name: fk_rails_4efde02858; Type: FK CONSTRAINT; Schema: public; Owner: -
+--
+
+ALTER TABLE ONLY user_achievements
+    ADD CONSTRAINT fk_rails_4efde02858 FOREIGN KEY (user_id) REFERENCES users(id);
+
+
 --
 -- Name: fk_rails_7a842b8743; Type: FK CONSTRAINT; Schema: public; Owner: -
 --