From eaa8edb6f72c0ef3b8e9900c0b84653b0000ee7b Mon Sep 17 00:00:00 2001
From: Pavan-Nambi <pavannambi999@gmail.com>
Date: Fri, 14 Nov 2025 07:41:41 +0530
Subject: [PATCH] don't overwrite col mappings

---
 asdfghhjkl               | Bin 0 -> 8192 bytes
 core/translate/insert.rs |   4 +++-
 idk.text                 |   1 +
 testing/insert.test      |   8 ++++++++
 wth.d                    |   0
 5 files changed, 12 insertions(+), 1 deletion(-)
 create mode 100644 asdfghhjkl
 create mode 100644 idk.text
 create mode 100644 wth.d

diff --git a/asdfghhjkl b/asdfghhjkl
new file mode 100644
index 0000000000000000000000000000000000000000..192c08d9b60bba3e0c3527a518e17c325ca0b854
GIT binary patch
literal 8192
zcmeI#F$w}f429uj5j$B6!P1o4XyFB1Wx8$Dy}$}92#O#nJcF0?DrSnUZLH*fOb8FA
z`nnwV^~F0o-ygTuZ7pL_m5rH*XiO2)C-*^LV(0!XD$Cbo6u-25OFV)A0tg_000Iag
zfB*srAb<b@zZaP4a9WnS^7eG?+>6~IRZX&{+SbW@{#@kSJdS>X00IagfB*srAb<b@
M2q1s}0)H&<0hFf@v;Y7A

literal 0
HcmV?d00001

diff --git a/core/translate/insert.rs b/core/translate/insert.rs
index 880e47399..6549eb5ff 100644
--- a/core/translate/insert.rs
+++ b/core/translate/insert.rs
@@ -1446,7 +1446,9 @@ fn build_insertion<'a>(
                         register: rowid_register,
                     });
                 } else {
-                    column_mappings[idx_in_table].value_index = Some(value_index);
+                    if column_mappings[idx_in_table].value_index.is_none() {
+                        column_mappings[idx_in_table].value_index = Some(value_index);
+                    }
                 }
             } else if ROWID_STRS
                 .iter()
diff --git a/idk.text b/idk.text
new file mode 100644
index 000000000..8fefeafed
--- /dev/null
+++ b/idk.text
@@ -0,0 +1 @@
+bans ok
diff --git a/testing/insert.test b/testing/insert.test
index e8c270aeb..5d4f9896e 100755
--- a/testing/insert.test
+++ b/testing/insert.test
@@ -865,3 +865,11 @@ do_execsql_test_in_memory_any_error wrong-column-count-partial-columns-values-to
     CREATE TABLE t(a, b, c);
     INSERT INTO t(a) VALUES (1, 2);
 }
+
+
+# https://github.com/tursodatabase/turso/issues/3951
+do_execsql_test_on_specific_db 1 {:memory:} insert-999999999  {
+create table t(a);
+insert into t(a, a) values (2, 3);
+select * from t;
+}{2}
\ No newline at end of file
diff --git a/wth.d b/wth.d
new file mode 100644
index 000000000..e69de29bb