diff --git a/identifiers/country-sg.csv b/identifiers/country-sg.csv
index f467f4c5..699d421b 100644
--- a/identifiers/country-sg.csv
+++ b/identifiers/country-sg.csv
@@ -1,33 +1,44 @@
-id,name
-ocd-division/country:sg,Singapore
-ocd-division/country:sg/ed:aljunied,Aljunied GRC
-ocd-division/country:sg/ed:ang_mo_kio,Ang Mo Kio GRC
-ocd-division/country:sg/ed:bishan-toa_payoh,Bishan-Toa Payoh GRC
-ocd-division/country:sg/ed:bukit_batok,Bukit Batok SMC
-ocd-division/country:sg/ed:bukit_panjang,Bukit Panjang SMC
-ocd-division/country:sg/ed:chua_chu_kang,Chua Chu Kang GRC
-ocd-division/country:sg/ed:east_coast,East Coast GRC
-ocd-division/country:sg/ed:holland-bukit_timah,Holland-Bukit Timah GRC
-ocd-division/country:sg/ed:hong_kah_north,Hong Kah North SMC
-ocd-division/country:sg/ed:hougang,Hougang SMC
-ocd-division/country:sg/ed:jalan_besar,Jalan Besar GRC
-ocd-division/country:sg/ed:jurong,Jurong GRC
-ocd-division/country:sg/ed:kebun_baru,Kebun Baru SMC
-ocd-division/country:sg/ed:macpherson,MacPherson SMC
-ocd-division/country:sg/ed:marine_parade,Marine Parade GRC
-ocd-division/country:sg/ed:marsiling-yew_tee,Marsiling-Yew Tee GRC
-ocd-division/country:sg/ed:marymount,Marymount SMC
-ocd-division/country:sg/ed:mountbatten,Mountbatten SMC
-ocd-division/country:sg/ed:nee_soon,Nee Soon GRC
-ocd-division/country:sg/ed:pasir_ris-punggol,Pasir Ris-Punggol GRC
-ocd-division/country:sg/ed:pioneer,Pioneer SMC
-ocd-division/country:sg/ed:potong_pasir,Potong Pasir SMC
-ocd-division/country:sg/ed:punggol_west,Punggol West SMC
-ocd-division/country:sg/ed:radin_mas,Radin Mas SMC
-ocd-division/country:sg/ed:sembawang,Sembawang GRC
-ocd-division/country:sg/ed:sengkang,Sengkang GRC
-ocd-division/country:sg/ed:tampines,Tampines GRC
-ocd-division/country:sg/ed:tanjong_pagar,Tanjong Pagar GRC
-ocd-division/country:sg/ed:west_coast,West Coast GRC
-ocd-division/country:sg/ed:yio_chu_kang,Yio Chu Kang SMC
-ocd-division/country:sg/ed:yuhua,Yuhua SMC
+id,name,sameAs,sameAsNote,validThrough,validFrom
+ocd-division/country:sg,Singapore,,,,
+ocd-division/country:sg/ed:aljunied,Aljunied GRC,,,,
+ocd-division/country:sg/ed:ang_mo_kio,Ang Mo Kio GRC,,,,
+ocd-division/country:sg/ed:bishan-toa_payoh,Bishan-Toa Payoh GRC,,,,
+ocd-division/country:sg/ed:bukit_batok,Bukit Batok SMC,,,2025-11,
+ocd-division/country:sg/ed:bukit_gombak,Bukit Gombak SMC,,,,2025-11
+ocd-division/country:sg/ed:bukit_panjang,Bukit Panjang SMC,,,,
+ocd-division/country:sg/ed:chua_chu_kang,Chua Chu Kang GRC,,,,
+ocd-division/country:sg/ed:east_coast,East Coast GRC,,,,
+ocd-division/country:sg/ed:holland-bukit_timah,Holland-Bukit Timah GRC,,,,
+ocd-division/country:sg/ed:hong_kah_north,Hong Kah North SMC,,,2025-11,
+ocd-division/country:sg/ed:hougang,Hougang SMC,,,,
+ocd-division/country:sg/ed:jalan_besar,Jalan Besar GRC,,,,
+ocd-division/country:sg/ed:jalan_kayu,Jalan Kayu SMC,,,,2025-11
+ocd-division/country:sg/ed:jurong,Jurong GRC,,,2025-11,
+ocd-division/country:sg/ed:jurong_central,Jurong Central SMC,,,,2025-11
+ocd-division/country:sg/ed:jurong_east-bukit_batok,Jurong East-Bukit Batok GRC,,,,2025-11
+ocd-division/country:sg/ed:kebun_baru,Kebun Baru SMC,,,,
+ocd-division/country:sg/ed:macpherson,MacPherson SMC,,,2025-11,
+ocd-division/country:sg/ed:marine_parade,Marine Parade GRC,ocd-division/country:sg/ed:marine_parade-braddell_heights,Marine Parade GRC renamed to Marine Parade-Braddell Heights ,,
+ocd-division/country:sg/ed:marine_parade-braddell_heights,Marine Parade-Braddell Heights GRC,,,,
+ocd-division/country:sg/ed:marsiling-yew_tee,Marsiling-Yew Tee GRC,,,,
+ocd-division/country:sg/ed:marymount,Marymount SMC,,,,
+ocd-division/country:sg/ed:mountbatten,Mountbatten SMC,,,,
+ocd-division/country:sg/ed:nee_soon,Nee Soon GRC,,,,
+ocd-division/country:sg/ed:pasir_ris-changi,Pasir Ris-Changi GRC,,,,2025-11
+ocd-division/country:sg/ed:pasir_ris-punggol,Pasir Ris-Punggol GRC,,,2025-11,
+ocd-division/country:sg/ed:pioneer,Pioneer SMC,,,,
+ocd-division/country:sg/ed:potong_pasir,Potong Pasir SMC,,,,
+ocd-division/country:sg/ed:punggol,Punggol GRC,,,,2025-11
+ocd-division/country:sg/ed:punggol_west,Punggol West SMC,,,2025-11,
+ocd-division/country:sg/ed:queenstown,Queenstown SMC,,,,2025-11
+ocd-division/country:sg/ed:radin_mas,Radin Mas SMC,,,,
+ocd-division/country:sg/ed:sembawang,Sembawang GRC,,,,
+ocd-division/country:sg/ed:sembawang_west,Sembawang West SMC,,,,2025-11
+ocd-division/country:sg/ed:sengkang,Sengkang GRC,,,,
+ocd-division/country:sg/ed:tampines,Tampines GRC,,,,
+ocd-division/country:sg/ed:tampines_changkat,Tampines Changkat SMC,,,,2025-11
+ocd-division/country:sg/ed:tanjong_pagar,Tanjong Pagar GRC,,,,
+ocd-division/country:sg/ed:west_coast,West Coast GRC,ocd-division/country:sg/ed:west_coast-jurong_west,West Coast GRC renamed to West Coast-Jurong West ,,
+ocd-division/country:sg/ed:west_coast-jurong_west,West Coast-Jurong West GRC,,,,
+ocd-division/country:sg/ed:yio_chu_kang,Yio Chu Kang SMC,,,,
+ocd-division/country:sg/ed:yuhua,Yuhua SMC,,,2025-11,
diff --git a/identifiers/country-sg/aliases.csv b/identifiers/country-sg/aliases.csv
new file mode 100644
index 00000000..8c974a48
--- /dev/null
+++ b/identifiers/country-sg/aliases.csv
@@ -0,0 +1,3 @@
+id,sameAs,sameAsNote
+ocd-division/country:sg/ed:marine_parade,ocd-division/country:sg/ed:marine_parade-braddell_heights,Marine Parade GRC renamed to Marine Parade-Braddell Heights 
+ocd-division/country:sg/ed:west_coast,ocd-division/country:sg/ed:west_coast-jurong_west,West Coast GRC renamed to West Coast-Jurong West 
diff --git a/identifiers/country-sg/constituencies.csv b/identifiers/country-sg/constituencies.csv
index a5846ff4..ddea4cdf 100644
--- a/identifiers/country-sg/constituencies.csv
+++ b/identifiers/country-sg/constituencies.csv
@@ -1,33 +1,44 @@
-id,name
-ocd-division/country:sg,Singapore
-ocd-division/country:sg/ed:bukit_batok,Bukit Batok SMC
-ocd-division/country:sg/ed:bukit_panjang,Bukit Panjang SMC
-ocd-division/country:sg/ed:hong_kah_north,Hong Kah North SMC
-ocd-division/country:sg/ed:hougang,Hougang SMC
-ocd-division/country:sg/ed:kebun_baru,Kebun Baru SMC
-ocd-division/country:sg/ed:macpherson,MacPherson SMC
-ocd-division/country:sg/ed:marymount,Marymount SMC
-ocd-division/country:sg/ed:mountbatten,Mountbatten SMC
-ocd-division/country:sg/ed:pioneer,Pioneer SMC
-ocd-division/country:sg/ed:potong_pasir,Potong Pasir SMC
-ocd-division/country:sg/ed:punggol_west,Punggol West SMC
-ocd-division/country:sg/ed:radin_mas,Radin Mas SMC
-ocd-division/country:sg/ed:yio_chu_kang,Yio Chu Kang SMC
-ocd-division/country:sg/ed:yuhua,Yuhua SMC
-ocd-division/country:sg/ed:bishan-toa_payoh,Bishan-Toa Payoh GRC
-ocd-division/country:sg/ed:chua_chu_kang,Chua Chu Kang GRC
-ocd-division/country:sg/ed:holland-bukit_timah,Holland-Bukit Timah GRC
-ocd-division/country:sg/ed:jalan_besar,Jalan Besar GRC
-ocd-division/country:sg/ed:marsiling-yew_tee,Marsiling-Yew Tee GRC
-ocd-division/country:sg/ed:sengkang,Sengkang GRC
-ocd-division/country:sg/ed:aljunied,Aljunied GRC
-ocd-division/country:sg/ed:ang_mo_kio,Ang Mo Kio GRC
-ocd-division/country:sg/ed:east_coast,East Coast GRC
-ocd-division/country:sg/ed:jurong,Jurong GRC
-ocd-division/country:sg/ed:marine_parade,Marine Parade GRC
-ocd-division/country:sg/ed:nee_soon,Nee Soon GRC
-ocd-division/country:sg/ed:pasir_ris-punggol,Pasir Ris-Punggol GRC
-ocd-division/country:sg/ed:sembawang,Sembawang GRC
-ocd-division/country:sg/ed:tampines,Tampines GRC
-ocd-division/country:sg/ed:tanjong_pagar,Tanjong Pagar GRC
-ocd-division/country:sg/ed:west_coast,West Coast GRC
\ No newline at end of file
+id,name,validFrom,validThrough
+ocd-division/country:sg,Singapore,,
+ocd-division/country:sg/ed:aljunied,Aljunied GRC,,
+ocd-division/country:sg/ed:ang_mo_kio,Ang Mo Kio GRC,,
+ocd-division/country:sg/ed:bishan-toa_payoh,Bishan-Toa Payoh GRC,,
+ocd-division/country:sg/ed:bukit_batok,Bukit Batok SMC,,2025-11
+ocd-division/country:sg/ed:bukit_gombak,Bukit Gombak SMC,2025-11,
+ocd-division/country:sg/ed:bukit_panjang,Bukit Panjang SMC,,
+ocd-division/country:sg/ed:chua_chu_kang,Chua Chu Kang GRC,,
+ocd-division/country:sg/ed:east_coast,East Coast GRC,,
+ocd-division/country:sg/ed:holland-bukit_timah,Holland-Bukit Timah GRC,,
+ocd-division/country:sg/ed:hong_kah_north,Hong Kah North SMC,,2025-11
+ocd-division/country:sg/ed:hougang,Hougang SMC,,
+ocd-division/country:sg/ed:jalan_besar,Jalan Besar GRC,,
+ocd-division/country:sg/ed:jalan_kayu,Jalan Kayu SMC,2025-11,
+ocd-division/country:sg/ed:jurong,Jurong GRC,,2025-11
+ocd-division/country:sg/ed:jurong_central,Jurong Central SMC,2025-11,
+ocd-division/country:sg/ed:jurong_east-bukit_batok,Jurong East-Bukit Batok GRC,2025-11,
+ocd-division/country:sg/ed:kebun_baru,Kebun Baru SMC,,
+ocd-division/country:sg/ed:macpherson,MacPherson SMC,,2025-11
+ocd-division/country:sg/ed:marine_parade,Marine Parade GRC,,
+ocd-division/country:sg/ed:marine_parade-braddell_heights,Marine Parade-Braddell Heights GRC,,
+ocd-division/country:sg/ed:marsiling-yew_tee,Marsiling-Yew Tee GRC,,
+ocd-division/country:sg/ed:marymount,Marymount SMC,,
+ocd-division/country:sg/ed:mountbatten,Mountbatten SMC,,
+ocd-division/country:sg/ed:nee_soon,Nee Soon GRC,,
+ocd-division/country:sg/ed:pasir_ris-changi,Pasir Ris-Changi GRC,2025-11,
+ocd-division/country:sg/ed:pasir_ris-punggol,Pasir Ris-Punggol GRC,,2025-11
+ocd-division/country:sg/ed:pioneer,Pioneer SMC,,
+ocd-division/country:sg/ed:potong_pasir,Potong Pasir SMC,,
+ocd-division/country:sg/ed:punggol,Punggol GRC,2025-11,
+ocd-division/country:sg/ed:punggol_west,Punggol West SMC,,2025-11
+ocd-division/country:sg/ed:queenstown,Queenstown SMC,2025-11,
+ocd-division/country:sg/ed:radin_mas,Radin Mas SMC,,
+ocd-division/country:sg/ed:sembawang,Sembawang GRC,,
+ocd-division/country:sg/ed:sembawang_west,Sembawang West SMC,2025-11,
+ocd-division/country:sg/ed:sengkang,Sengkang GRC,,
+ocd-division/country:sg/ed:tampines,Tampines GRC,,
+ocd-division/country:sg/ed:tampines_changkat,Tampines Changkat SMC,2025-11,
+ocd-division/country:sg/ed:tanjong_pagar,Tanjong Pagar GRC,,
+ocd-division/country:sg/ed:west_coast,West Coast GRC,,
+ocd-division/country:sg/ed:west_coast-jurong_west,West Coast-Jurong West GRC,,
+ocd-division/country:sg/ed:yio_chu_kang,Yio Chu Kang SMC,,
+ocd-division/country:sg/ed:yuhua,Yuhua SMC,,2025-11