fix(bun): ignore scanonly columns in ExcludeColumn

Bun's ExcludeColumn errors with "can't find column" for scanonly fields
because they are not in the table's writable fields. Filter the exclude
list to writable bun fields so models with scanonly buffers can insert
and update again. Add tests for the adapter and reflection.

pkg/common/adapters/database/bun.go

@@ -10,6 +10,7 @@ import (
 	"time"
 
 	"github.com/uptrace/bun"
+	"github.com/uptrace/bun/schema"
 
 	"github.com/bitechdev/ResolveSpec/pkg/common"
 	"github.com/bitechdev/ResolveSpec/pkg/dbtrace"
@@ -1507,8 +1508,30 @@ func (b *BunInsertQuery) OnConflict(action string) common.InsertQuery {
 	return b
 }
 
+// bunWritableExcludes drops columns bun already leaves out of INSERT/UPDATE
+// (scanonly fields) or does not know, since bun's ExcludeColumn errors with
+// "can't find column" for anything that is not in the table's writable fields.
+func bunWritableExcludes(model bun.Model, columns []string) []string {
+	tm, ok := model.(interface{ Table() *schema.Table })
+	if !ok || tm.Table() == nil {
+		return columns
+	}
+	table := tm.Table()
+	writable := make(map[string]struct{}, len(table.Fields))
+	for _, f := range table.Fields {
+		writable[f.Name] = struct{}{}
+	}
+	out := make([]string, 0, len(columns))
+	for _, c := range columns {
+		if _, ok := writable[c]; ok || c == "*" {
+			out = append(out, c)
+		}
+	}
+	return out
+}
+
 func (b *BunInsertQuery) ExcludeColumn(columns ...string) common.InsertQuery {
-	if len(columns) > 0 {
+	if columns = bunWritableExcludes(b.query.GetModel(), columns); len(columns) > 0 {
 		b.query = b.query.ExcludeColumn(columns...)
 	}
 	return b
@@ -1627,7 +1650,7 @@ func (b *BunUpdateQuery) SetMap(values map[string]interface{}) common.UpdateQuer
 }
 
 func (b *BunUpdateQuery) ExcludeColumn(columns ...string) common.UpdateQuery {
-	if len(columns) > 0 {
+	if columns = bunWritableExcludes(b.query.GetModel(), columns); len(columns) > 0 {
 		b.query = b.query.ExcludeColumn(columns...)
 	}
 	return b