Generally, feature tables consist of the following columns:
A feature_id. The column name should be tablename_id. Not all features need to have a feature ID. All features that have links in other tables need one; others might have one out of consistency reasons. In the future they may become mandatory.
All features describe their sequence position with a link to the seq_region they are defined on. They have seq_start and seq_end on this region, which range from 1 to the length of the linked seq_region. Most will have strand information. The strand does not change the counting for the sequence position, which always happens from the 5-prime end of the seq_region.
Many features will contain a displayable name (display_label or name). Future changes might make this more consistent.
Almost all features link to an analysis entry.
Special features contain any number of other attributes; simple_feature entries for example contain a score entry.
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