test(drawdb): add test for converting column types with modifiers

* Implement tests to ensure explicit type modifiers are preserved during conversion.
* Validate behavior for varchar, numeric, and custom vector types.

pkg/readers/drawdb/reader_test.go

@@ -6,6 +6,7 @@ import (
 
 	"git.warky.dev/wdevs/relspecgo/pkg/models"
 	"git.warky.dev/wdevs/relspecgo/pkg/readers"
+	"git.warky.dev/wdevs/relspecgo/pkg/writers/drawdb"
 )
 
 func TestReader_ReadDatabase_Simple(t *testing.T) {
@@ -288,6 +289,61 @@ func TestReader_ReadDatabase_Complex(t *testing.T) {
 	}
 }
 
+func TestConvertToColumn_PreservesExplicitTypeModifiers(t *testing.T) {
+	reader := &Reader{}
+
+	tests := []struct {
+		name          string
+		fieldType     string
+		wantType      string
+		wantLength    int
+		wantPrecision int
+		wantScale     int
+	}{
+		{
+			name:       "varchar with length",
+			fieldType:  "varchar(255)",
+			wantType:   "varchar(255)",
+			wantLength: 255,
+		},
+		{
+			name:          "numeric precision/scale",
+			fieldType:     "numeric(10,2)",
+			wantType:      "numeric(10,2)",
+			wantPrecision: 10,
+			wantScale:     2,
+		},
+		{
+			name:       "custom vector modifier",
+			fieldType:  "vector(1536)",
+			wantType:   "vector(1536)",
+			wantLength: 1536,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			field := &drawdb.DrawDBField{
+				Name: tt.name,
+				Type: tt.fieldType,
+			}
+			col := reader.convertToColumn(field, "events", "public")
+			if col.Type != tt.wantType {
+				t.Fatalf("column type = %q, want %q", col.Type, tt.wantType)
+			}
+			if col.Length != tt.wantLength {
+				t.Fatalf("column length = %d, want %d", col.Length, tt.wantLength)
+			}
+			if col.Precision != tt.wantPrecision {
+				t.Fatalf("column precision = %d, want %d", col.Precision, tt.wantPrecision)
+			}
+			if col.Scale != tt.wantScale {
+				t.Fatalf("column scale = %d, want %d", col.Scale, tt.wantScale)
+			}
+		})
+	}
+}
+
 func TestReader_ReadSchema(t *testing.T) {
 	opts := &readers.ReaderOptions{
 		FilePath: filepath.Join("..", "..", "..", "tests", "assets", "drawdb", "simple.json"),