diff --git a/pkg/common/test_addprefix_test.go b/pkg/common/test_addprefix_test.go
new file mode 100644
index 0000000..377040e
--- /dev/null
+++ b/pkg/common/test_addprefix_test.go
@@ -0,0 +1,63 @@
+package common
+
+import (
+"fmt"
+"testing"
+)
+
+func TestAddTablePrefixToColumns_BugRepro(t *testing.T) {
+tests := []struct {
+name      string
+where     string
+tableName string
+expected  string
+}{
+{
+name:      "SQL literal true - should not add prefix",
+where:     "true",
+tableName: "mastertask",
+expected:  "true",
+},
+{
+name:      "SQL literal TRUE uppercase - should not add prefix",
+where:     "TRUE",
+tableName: "mastertask",
+expected:  "TRUE",
+},
+{
+name:      "SQL literal false - should not add prefix",
+where:     "false",
+tableName: "mastertask",
+expected:  "false",
+},
+{
+name:      "SQL literal null - should not add prefix",
+where:     "null",
+tableName: "mastertask",
+expected:  "null",
+},
+{
+name:      "SQL literal NULL uppercase - should not add prefix",
+where:     "NULL",
+tableName: "mastertask",
+expected:  "NULL",
+},
+{
+name:      "Multiple true conditions",
+where:     "true AND true",
+tableName: "mastertask",
+expected:  "true AND true",
+},
+}
+
+for _, tt := range tests {
+t.Run(tt.name, func(t *testing.T) {
+result := AddTablePrefixToColumns(tt.where, tt.tableName)
+if result != tt.expected {
+t.Errorf("AddTablePrefixToColumns(%q, %q) = %q; want %q", tt.where, tt.tableName, result, tt.expected)
+} else {
+fmt.Printf("✓ Test passed: %s\n", tt.name)
+}
+})
+}
+}
diff --git a/pkg/common/test_unregistered_test.go b/pkg/common/test_unregistered_test.go
new file mode 100644
index 0000000..4e4d4a2
--- /dev/null
+++ b/pkg/common/test_unregistered_test.go
@@ -0,0 +1,51 @@
+package common
+
+import (
+"fmt"
+"testing"
+)
+
+func TestAddTablePrefixToColumns_UnregisteredModel(t *testing.T) {
+tests := []struct {
+name      string
+where     string
+tableName string
+expected  string
+}{
+{
+name:      "SQL literal true with unregistered model - should not add prefix",
+where:     "true",
+tableName: "unregistered_table",
+expected:  "true",
+},
+{
+name:      "SQL literal false with unregistered model - should not add prefix",
+where:     "false",
+tableName: "unregistered_table",
+expected:  "false",
+},
+{
+name:      "SQL literal null with unregistered model - should not add prefix",
+where:     "null",
+tableName: "unregistered_table",
+expected:  "null",
+},
+{
+name:      "Valid column with unregistered model - should not add prefix (no validation)",
+where:     "status = 'active'",
+tableName: "unregistered_table",
+expected:  "unregistered_table.status = 'active'",
+},
+}
+
+for _, tt := range tests {
+t.Run(tt.name, func(t *testing.T) {
+result := AddTablePrefixToColumns(tt.where, tt.tableName)
+if result != tt.expected {
+t.Errorf("AddTablePrefixToColumns(%q, %q) = %q; want %q", tt.where, tt.tableName, result, tt.expected)
+} else {
+fmt.Printf("✓ Test passed: %s\n", tt.name)
+}
+})
+}
+}