How to log changes of ActiveRecords?

Comparing #9 with #12

Content

[...]

model VARCHAR(45) NULL,
idModel INTEGER UNSIGNED NULL,
field VARCHAR(45) NULL,
creationdate TIMESTAMP NOT NULL,
userid VARCHAR(45) NULL,
PRIMARY KEY(id~~ActiveRecordLog~~)
)
TYPE=InnoDB;

[...]

+ savethe attributeLabels instead of the field names
+ make description customizable
+ and so on...