AdditionalPruningThreshold is the additional threshold (to BMD), which is needed, because the messages in the getMilestoneParents call in solidEntryPoints can reference older messages as well.

whether to delete old message data from the database based on maximum milestones to keep.

maximum amount of milestone cones to keep in the database.

whether to delete old receipts data from the database.

cooldown time between two pruning by database size events.

whether to delete old message data from the database based on maximum database size.

target size of the database.

the percentage the database size gets reduced if the target size is reached.

path to the delta snapshot file.

create a full snapshot if the size of a delta snapshot reaches a certain percentage of the full snapshot (0.0 = always create delta snapshot to keep ms diff history).

the depth, respectively the starting point, at which a snapshot of the ledger is generated.

URLs to load the snapshot files from.

whether to generate snapshot files.

force loading of a snapshot, even if a database already exists.

path to the full snapshot file.

interval, in milestones, at which snapshot files are created (snapshots are only created if the node is synced).

SolidEntryPointCheckAdditionalThresholdFuture is the additional future cone (to BMD) that is needed to calculate solid entry points correctly.

SolidEntryPointCheckAdditionalThresholdPast is the additional past cone (to BMD) that is walked to calculate the solid entry points.