From 9bfb31798cd887a520ef178a336406a06ec0897b Mon Sep 17 00:00:00 2001
From: ~wispem-wantex <wispem-wantex@playfulpachyderm.com>
Date: Sat, 14 Feb 2026 18:33:41 -0800
Subject: [PATCH] codegen: don't auto-timestamp overwrite provided timestamps
 if there are ones

---
 pkg/codegen/modelgenerate/generate_model.go | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/pkg/codegen/modelgenerate/generate_model.go b/pkg/codegen/modelgenerate/generate_model.go
index 414e028..944fe7a 100644
--- a/pkg/codegen/modelgenerate/generate_model.go
+++ b/pkg/codegen/modelgenerate/generate_model.go
@@ -403,10 +403,21 @@ func GenerateSaveItemFunc(tbl schema.Table) *ast.FuncDecl {
 								ret1 := []ast.Stmt{Comment("Do create")}
 								if hasCreatedAt {
 									// Auto-timestamps: created_at
-									ret1 = append(ret1, &ast.AssignStmt{
-										Lhs: []ast.Expr{&ast.SelectorExpr{X: ast.NewIdent(tbl.VarName), Sel: ast.NewIdent("CreatedAt")}},
-										Tok: token.ASSIGN,
-										Rhs: []ast.Expr{&ast.CallExpr{Fun: ast.NewIdent("TimestampNow"), Args: []ast.Expr{}}},
+									ret1 = append(ret1, &ast.IfStmt{
+										// Don't overwrite existing timestamps.  This is useful for various reasons, e.g., data import / migrations
+										Cond: &ast.CallExpr{Fun: &ast.SelectorExpr{
+											X:   &ast.SelectorExpr{X: ast.NewIdent(tbl.VarName), Sel: ast.NewIdent("CreatedAt")},
+											Sel: ast.NewIdent("IsZero"),
+										}},
+										Body: &ast.BlockStmt{
+											List: []ast.Stmt{
+												&ast.AssignStmt{
+													Lhs: []ast.Expr{&ast.SelectorExpr{X: ast.NewIdent(tbl.VarName), Sel: ast.NewIdent("CreatedAt")}},
+													Tok: token.ASSIGN,
+													Rhs: []ast.Expr{&ast.CallExpr{Fun: ast.NewIdent("TimestampNow"), Args: []ast.Expr{}}},
+												},
+											},
+										},
 									})
 								}
 								return append(ret1, namedExecStmt(insertStmt)...)