What is the most efficient way to model key value tags on records. The keys and values will be variable and changing over time. The values may be of various types (numbers, dates, strings etc). There will be filters and group by selects based on tag names and maybe even tag values.
Postgres gives me the option of using hstore, JSON or just a linked table with all the keys and values and I am wondering which would be most efficient in terms of SELECT speeds. The writes are done in batches so this is mostly for analytical purposes.