I have an email from DaveB stashed in my mailbox containing this info:
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Here is some of the core data model
Data_Model_OpenACS.htm
And some probably too detailed documentation of every table
HTML descriptions https://openacs.org/storage/view/miscellaneous/oacs_5_kernel.html
Graphic of tables and relationships https://openacs.org/storage/view/miscellaneous/oacs_5_kernel.png
and the same graphic as a PDF https://openacs.org/storage/view/miscellaneous/oacs_5_kernel.pdf
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