diff --git a/schema/sdss5db/targetdb/load_table/targeting_generation/README.txt b/schema/sdss5db/targetdb/load_table/targeting_generation/README.txt
index 95486893..c5fd8740 100644
--- a/schema/sdss5db/targetdb/load_table/targeting_generation/README.txt
+++ b/schema/sdss5db/targetdb/load_table/targeting_generation/README.txt
@@ -250,7 +250,9 @@ CREATE TABLE IF NOT EXISTS sandbox.targeting_generation (
     label TEXT,
     first_release TEXT
 );
-TRUNCATE sandbox.targeting_generation;
+
+ALTER TABLE sandbox.targeting_generation DROP CONSTRAINT IF EXISTS targeting_generation_pk_key;
+ALTER TABLE sandbox.targeting_generation ADD CONSTRAINT targeting_generation_pk_key UNIQUE (pk);
 
 INSERT INTO sandbox.targeting_generation (pk, label, first_release)
     SELECT * FROM targeting_generation_temp ON CONFLICT DO NOTHING;
@@ -274,8 +276,9 @@ CREATE TABLE IF NOT EXISTS sandbox.targeting_generation_to_carton (
     rs_stage TEXT,
     rs_active BOOLEAN
 );
-
-TRUNCATE sandbox.targeting_generation_to_carton;
+ALTER TABLE sandbox.targeting_generation_to_carton DROP CONSTRAINT IF EXISTS targeting_generation_to_carton_pk_key;
+ALTER TABLE sandbox.targeting_generation_to_carton ADD CONSTRAINT targeting_generation_to_carton_pk_key UNIQUE (generation_pk,carton_pk);
+# TRUNCATE sandbox.targeting_generation_to_carton;
  
 INSERT INTO sandbox.targeting_generation_to_carton (generation_pk, carton_pk, rs_stage, rs_active)
     SELECT * FROM targeting_generation_to_carton_temp ON CONFLICT DO NOTHING;
@@ -293,7 +296,10 @@ CREATE TABLE IF NOT EXISTS sandbox.targeting_generation_to_version (
     generation_pk INTEGER,
     version_pk INTEGER
 );
-TRUNCATE sandbox.targeting_generation_to_version;
+
+ALTER TABLE sandbox.targeting_generation_to_version DROP CONSTRAINT IF EXISTS targeting_generation_to_version_uniq_key;
+ALTER TABLE sandbox.targeting_generation_to_version ADD CONSTRAINT targeting_generation_to_version_uniq_key UNIQUE (generation_pk,version_pk);
+# TRUNCATE sandbox.targeting_generation_to_version;
 
 INSERT INTO sandbox.targeting_generation_to_version (generation_pk, version_pk)
     SELECT * FROM targeting_generation_to_version_temp ON CONFLICT DO NOTHING;
diff --git a/schema/sdss5db/targetdb/load_table/targeting_generation/load_targeting_generation.sql b/schema/sdss5db/targetdb/load_table/targeting_generation/load_targeting_generation.sql
index bcd720a7..1caf696a 100644
--- a/schema/sdss5db/targetdb/load_table/targeting_generation/load_targeting_generation.sql
+++ b/schema/sdss5db/targetdb/load_table/targeting_generation/load_targeting_generation.sql
@@ -8,6 +8,9 @@ TRUNCATE targeting_generation_temp;
 
 \copy targeting_generation_temp FROM 'targeting_generation.csv' WITH CSV HEADER;
 
+ALTER TABLE targetdb.targeting_generation DROP CONSTRAINT IF EXISTS targeting_generation_uniq_key;
+ALTER TABLE targetdb.targeting_generation ADD CONSTRAINT targeting_generation_uniq_key UNIQUE (pk);
+
 INSERT INTO targetdb.targeting_generation (pk, label, first_release)
     SELECT * FROM targeting_generation_temp ON CONFLICT DO NOTHING;
 
@@ -22,6 +25,9 @@ TRUNCATE targeting_generation_to_carton_temp;
 
 \copy targeting_generation_to_carton_temp FROM 'targeting_generation_to_carton.csv' WITH CSV HEADER;
 
+ALTER TABLE targetdb.targeting_generation_to_carton DROP CONSTRAINT IF EXISTS targeting_generation_to_carton_uniq_key;
+ALTER TABLE targetdb.targeting_generation_to_carton ADD CONSTRAINT targeting_generation_to_carton_uniq_key UNIQUE (generation_pk,carton_pk);
+
 INSERT INTO targetdb.targeting_generation_to_carton (generation_pk, carton_pk, rs_stage, rs_active)
     SELECT * FROM targeting_generation_to_carton_temp ON CONFLICT DO NOTHING;
 
@@ -34,5 +40,8 @@ TRUNCATE targeting_generation_to_version_temp;
 
 \copy targeting_generation_to_version_temp FROM 'targeting_generation_to_version.csv' WITH CSV HEADER;
 
+ALTER TABLE targetdb.targeting_generation_to_version DROP CONSTRAINT IF EXISTS targeting_generation_to_version_uniq_key;
+ALTER TABLE targetdb.targeting_generation_to_version ADD CONSTRAINT targeting_generation_to_version_uniq_key UNIQUE (generation_pk,version_pk);
+
 INSERT INTO targetdb.targeting_generation_to_version (generation_pk, version_pk)
     SELECT * FROM targeting_generation_to_version_temp ON CONFLICT DO NOTHING;