better error message

Author: cenkalti

internal/inserter/eventinserter/eventinserter.go

@@ -40,7 +40,7 @@ func (i EventInserter) InsertSQL(def property.Types, t time.Time) (string, []int
 		sb.WriteString(string(pname))
 		val, err := ptype.ConvertValue(pval)
 		if err != nil {
-			return "", nil, err
+			return "", nil, errors.New("cannot read property (" + string(pname) + "): " + err.Error())
 		}
 		values = append(values, val)
 	}

internal/inserter/userinserter/userinserter.go

@@ -34,7 +34,7 @@ func (i UserInserter) InsertSQL(def property.Types, t time.Time) (string, []inte
 		sb.WriteString(string(pname))
 		val, err := ptype.ConvertValue(pval)
 		if err != nil {
-			return "", nil, err
+			return "", nil, errors.New("cannot read property (" + string(pname) + "): " + err.Error())
 		}
 		values = append(values, val)
 	}