what does expiry actually mean?

[jessykate]

what are the semantics of expiry? current thinking:

• expired pads do not show up on the listing page
• users can always go back and access expired pads that they have participated in/saved
• the pad becomes readonly once it expires?
• can a user revive a pad? or do they have to create a new one?
• can they link two pads together? (eg. if i create a pad for my house and then it expires and then i create a new pad, i may want to somehow create an implicit association between those pads by linking one to the other?) (<-- IMHO this is getting a bit too fancy pants for now, unless it is a natural desire that emerges out of actual use).