Imported current DB structure

Included recent update scripts, current dump and a description of
how the tables have been used or are being used

db/README.md

@@ -0,0 +1,49 @@
+CERNBox DB schema
+=================
+
+The CERNBox database schema inherits the ownCloud 10 schema and adds Reva-specific tables.
+
+This file describes the state of the database following a reverse engineering analysis.
+
+The following tables with their corresponding cardinalities are used in production and referenced in Reva as of July 2023:
+
+* oc_preferences            # 65K
+* oc_share                  # 490K
+* oc_share_status           # 24K
+
+* cernbox_project_mapping   # 1K
+* cbox_metadata             # 10K, to store favourites
+* cbox_otg_ocis             # empty, to be deprecated in favour of notifications
+
+* notifications             # the dump script currently contains cbox_notifications, to be fixed
+* notification_recipients
+
+* ocm_access_method_webapp
+* ocm_access_method_webdav
+* ocm_protocol_transfer
+* ocm_protocol_webapp
+* ocm_protocol_webdav
+* ocm_received_share_protocols
+* ocm_received_shares
+* ocm_remote_users
+* ocm_shares
+* ocm_shares_access_methods
+* ocm_tokens
+
+The following tables contain several records (possibly used by ownCloud in the past) but are not used by Reva:
+
+* oc_mounts
+* oc_share_acl
+* oc_share_acl_old
+* oc_addressbooks
+* oc_accounts
+
+The following tables were used in the past but not any longer:
+
+* cbox_canary
+* cbox_office_engine
+
+The following table was populated by hand and it is not used by Reva:
+
+* oc_sciencemesh
+