diff --git a/5_GEONATURE/MIGRATION/RNGL/make_foreignkey.py b/5_GEONATURE/MIGRATION/RNGL/make_foreignkey.py
new file mode 100644
index 0000000..2e07e5f
--- /dev/null
+++ b/5_GEONATURE/MIGRATION/RNGL/make_foreignkey.py
@@ -0,0 +1,80 @@
+from sqlalchemy import create_engine                      # pour lecture de la bd Géonature
+from sqlalchemy.engine import URL
+from pycen import update_to_sql
+import pandas as pd
+
+usr = 'postgres'
+pdw = 'postgres'
+bdd = 'serenadb'
+host = '172.17.0.2'
+
+eng = URL.create('postgresql+psycopg2',username=usr,password=pdw,host=host,database=bdd)
+conn = create_engine(eng)
+
+obs = pd.read_sql_table('rnf_obse',con=conn,schema='serenabase')
+
+
+
+## Foreign keys table : serenabase.rnf_choi
+id_cols = obs.columns[obs.columns.str.endswith('_choi_id')]
+
+update_to_sql(obs[['obse_id',*id_cols]].replace(0,None).astype('Int64'),
+    conn,'rnf_obse','serenabase','obse_id')
+
+with conn.begin() as cnx:
+    cnx.execute('ALTER TABLE serenabase.rnf_obse ADD CONSTRAINT rnf_obse_rnf_choi_sexe_fk FOREIGN KEY (obse_sex_choi_id) REFERENCES serenabase.rnf_choi(choi_id);')
+with conn.begin() as cnx:
+    cnx.execute('ALTER TABLE serenabase.rnf_obse ADD CONSTRAINT rnf_obse_rnf_choi_stade_fk FOREIGN KEY (obse_stade_choi_id) REFERENCES serenabase.rnf_choi(choi_id);')
+with conn.begin() as cnx:
+    cnx.execute('ALTER TABLE serenabase.rnf_obse ADD CONSTRAINT rnf_obse_rnf_choi_ageunit_fk FOREIGN KEY (obse_ageunit_choi_id) REFERENCES serenabase.rnf_choi(choi_id);')
+with conn.begin() as cnx:
+    cnx.execute('ALTER TABLE serenabase.rnf_obse ADD CONSTRAINT rnf_obse_rnf_choi_abond_fk FOREIGN KEY (obse_abond_choi_id) REFERENCES serenabase.rnf_choi(choi_id);')
+with conn.begin() as cnx:
+    cnx.execute('ALTER TABLE serenabase.rnf_obse ADD CONSTRAINT rnf_obse_rnf_choi_precis_fk FOREIGN KEY (obse_precis_choi_id) REFERENCES serenabase.rnf_choi(choi_id);')
+with conn.begin() as cnx:
+    cnx.execute('ALTER TABLE serenabase.rnf_obse ADD CONSTRAINT rnf_obse_rnf_choi_soci_fk FOREIGN KEY (obse_soci_choi_id) REFERENCES serenabase.rnf_choi(choi_id);')
+with conn.begin() as cnx:
+    cnx.execute('ALTER TABLE serenabase.rnf_obse ADD CONSTRAINT rnf_obse_rnf_choi_comp_fk FOREIGN KEY (obse_comp_choi_id) REFERENCES serenabase.rnf_choi(choi_id);')
+with conn.begin() as cnx:
+    cnx.execute('ALTER TABLE serenabase.rnf_obse ADD CONSTRAINT rnf_obse_rnf_choi_compdir_fk FOREIGN KEY (obse_compdir_choi_id) REFERENCES serenabase.rnf_choi(choi_id);')
+with conn.begin() as cnx:
+    cnx.execute('ALTER TABLE serenabase.rnf_obse ADD CONSTRAINT rnf_obse_rnf_choi_contact_fk FOREIGN KEY (obse_contact_choi_id) REFERENCES serenabase.rnf_choi(choi_id);')
+with conn.begin() as cnx:
+    cnx.execute('ALTER TABLE serenabase.rnf_obse ADD CONSTRAINT rnf_obse_rnf_choi_contact2_fk FOREIGN KEY (obse_contact2_choi_id) REFERENCES serenabase.rnf_choi(choi_id);')
+with conn.begin() as cnx:
+    cnx.execute('ALTER TABLE serenabase.rnf_obse ADD CONSTRAINT rnf_obse_rnf_choi_activ_fk FOREIGN KEY (obse_activ_choi_id) REFERENCES serenabase.rnf_choi(choi_id);')
+with conn.begin() as cnx:
+    cnx.execute('ALTER TABLE serenabase.rnf_obse ADD CONSTRAINT rnf_obse_rnf_choi_caract_fk FOREIGN KEY (obse_caract_choi_id) REFERENCES serenabase.rnf_choi(choi_id);')
+with conn.begin() as cnx:
+    cnx.execute('ALTER TABLE serenabase.rnf_obse ADD CONSTRAINT rnf_obse_rnf_choi_etat_fk FOREIGN KEY (obse_etat_choi_id) REFERENCES serenabase.rnf_choi(choi_id);')
+with conn.begin() as cnx:
+    cnx.execute('ALTER TABLE serenabase.rnf_obse ADD CONSTRAINT rnf_obse_rnf_choi_derango_fk FOREIGN KEY (obse_derango_choi_id) REFERENCES serenabase.rnf_choi(choi_id);')
+with conn.begin() as cnx:
+    cnx.execute('ALTER TABLE serenabase.rnf_obse ADD CONSTRAINT rnf_obse_rnf_choi_derangi_fk FOREIGN KEY (obse_derangi_choi_id) REFERENCES serenabase.rnf_choi(choi_id);')
+with conn.begin() as cnx:
+    cnx.execute('ALTER TABLE serenabase.rnf_obse ADD CONSTRAINT rnf_obse_rnf_choi_nebul_fk FOREIGN KEY (obse_nebul_choi_id) REFERENCES serenabase.rnf_choi(choi_id);')
+with conn.begin() as cnx:
+    cnx.execute('ALTER TABLE serenabase.rnf_obse ADD CONSTRAINT rnf_obse_rnf_choi_precip_fk FOREIGN KEY (obse_precip_choi_id) REFERENCES serenabase.rnf_choi(choi_id);')
+with conn.begin() as cnx:
+    cnx.execute('ALTER TABLE serenabase.rnf_obse ADD CONSTRAINT rnf_obse_rnf_choi_vent_fk FOREIGN KEY (obse_vent_choi_id) REFERENCES serenabase.rnf_choi(choi_id);')
+with conn.begin() as cnx:
+    cnx.execute('ALTER TABLE serenabase.rnf_obse ADD CONSTRAINT rnf_obse_rnf_choi_ventdir_fk FOREIGN KEY (obse_ventdir_choi_id) REFERENCES serenabase.rnf_choi(choi_id);')
+with conn.begin() as cnx:
+    cnx.execute('ALTER TABLE serenabase.rnf_obse ADD CONSTRAINT rnf_obse_rnf_choi_visib_fk FOREIGN KEY (obse_visib_choi_id) REFERENCES serenabase.rnf_choi(choi_id);')
+with conn.begin() as cnx:
+    cnx.execute('ALTER TABLE serenabase.rnf_obse ADD CONSTRAINT rnf_obse_rnf_choi_sol_fk FOREIGN KEY (obse_sol_choi_id) REFERENCES serenabase.rnf_choi(choi_id);')
+with conn.begin() as cnx:
+    cnx.execute('ALTER TABLE serenabase.rnf_obse ADD CONSTRAINT rnf_obse_rnf_choi_eau_fk FOREIGN KEY (obse_eau_choi_id) REFERENCES serenabase.rnf_choi(choi_id);')
+with conn.begin() as cnx:
+    cnx.execute('ALTER TABLE serenabase.rnf_obse ADD CONSTRAINT rnf_obse_rnf_choi_eaudir_fk FOREIGN KEY (obse_eaudir_choi_id) REFERENCES serenabase.rnf_choi(choi_id);')
+
+
+id_cols = obs.columns[obs.columns.str.endswith('user_id')]
+with conn.begin() as cnx:
+    cnx.execute('ALTER TABLE serenabase.rnf_obse ADD CONSTRAINT rnf_obse_rnf_user_crea_fk FOREIGN KEY (obse_crea_user_id) REFERENCES serenabase.rnf_user(user_id);')
+
+# DETAIL:  La clé (obse_lmod_user_id)=(bbb76b84-493a-4d26-8f01-0440d377198b) n'est pas présente dans la table « rnf_user ».
+# with conn.begin() as cnx:
+#     cnx.execute('ALTER TABLE serenabase.rnf_obse ADD CONSTRAINT rnf_obse_rnf_user_lmod_fk FOREIGN KEY (obse_lmod_user_id) REFERENCES serenabase.rnf_user(user_id);')
+
+id_cols = obs.columns[(obs.columns.str.endswith('_id'))& (~obs.columns.str.contains('choi'))]
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