diff --git a/pkg/repository/db/postgres/ddl/6_constraint_fk_humidities_sensor_id.down.sql b/pkg/repository/db/postgres/ddl/6_constraint_fk_humidities_sensor_id.down.sql
new file mode 100644
index 0000000..a4d1353
--- /dev/null
+++ b/pkg/repository/db/postgres/ddl/6_constraint_fk_humidities_sensor_id.down.sql
@@ -0,0 +1,9 @@
+ALTER TABLE humidities
+DROP CONSTRAINT fk_humidites_sensor_id;
+
+ALTER TABLE humidities
+ADD CONSTRAINT pk_humidites_sensor_id
+FOREIGN KEY (sensor_id)
+REFERENCES sensors(sensor_id)
+ON DELETE CASCADE
+ON UPDATE CASCADE;
\ No newline at end of file
diff --git a/pkg/repository/db/postgres/ddl/6_constraint_fk_humidities_sensor_id.up.sql b/pkg/repository/db/postgres/ddl/6_constraint_fk_humidities_sensor_id.up.sql
new file mode 100644
index 0000000..999e793
--- /dev/null
+++ b/pkg/repository/db/postgres/ddl/6_constraint_fk_humidities_sensor_id.up.sql
@@ -0,0 +1,9 @@
+ALTER TABLE humidities
+DROP CONSTRAINT pk_humidites_sensor_id;
+
+ALTER TABLE humidities
+ADD CONSTRAINT fk_humidites_sensor_id
+FOREIGN KEY (sensor_id)
+REFERENCES sensors(sensor_id)
+ON DELETE CASCADE
+ON UPDATE CASCADE;
\ No newline at end of file
diff --git a/pkg/repository/db/postgres/ddl/7_constraint_fk_pressures_sensor_id.down.sql b/pkg/repository/db/postgres/ddl/7_constraint_fk_pressures_sensor_id.down.sql
new file mode 100644
index 0000000..fa7c7a4
--- /dev/null
+++ b/pkg/repository/db/postgres/ddl/7_constraint_fk_pressures_sensor_id.down.sql
@@ -0,0 +1,9 @@
+ALTER TABLE pressures
+DROP CONSTRAINT fk_pressures_sensor_id;
+
+ALTER TABLE pressures
+ADD CONSTRAINT pk_pressures_sensor_id
+FOREIGN KEY (sensor_id)
+REFERENCES sensors(sensor_id)
+ON DELETE CASCADE
+ON UPDATE CASCADE;
\ No newline at end of file
diff --git a/pkg/repository/db/postgres/ddl/7_constraint_fk_pressures_sensor_id.up.sql b/pkg/repository/db/postgres/ddl/7_constraint_fk_pressures_sensor_id.up.sql
new file mode 100644
index 0000000..3460754
--- /dev/null
+++ b/pkg/repository/db/postgres/ddl/7_constraint_fk_pressures_sensor_id.up.sql
@@ -0,0 +1,9 @@
+ALTER TABLE pressures
+DROP CONSTRAINT pk_pressures_sensor_id;
+
+ALTER TABLE pressures
+ADD CONSTRAINT fk_pressures_sensor_id
+FOREIGN KEY (sensor_id)
+REFERENCES sensors(sensor_id)
+ON DELETE CASCADE
+ON UPDATE CASCADE;
\ No newline at end of file