Research: per-item equipment slot types, bench names, steamid in player saves

Probes: tests/AbioticEditor.Tests/SlotTypeProbeTests.cs (all guarded - they skip without a game install / the dedicated-server tree). Run 2026-06-12 against ItemTable_Global (game build matching AbioticFactor-5.4.4-1030002 mappings), the checked-in Cascade fixture, and the user's live server tree (b31789b5-.../SaveGames/Server/Worlds/Cascade).

Q1 - Which ItemTable column encodes the equipment slot

Column: EquipmentData_100_576D05464F36104AFE501B878255E318 -> EquipSlot_5_7DAF59D54ADD37B8594D91A65C47292E (byte enum, E_InventorySlotType).

It is the FIRST column of the EquipmentData struct, alongside (full column list, verified via Probe1): CanAutoEquip_7_8C31C786..., ArmorBonus_18_84B6DFE7..., HeatResist_52_E754E645..., ColdResist_53_B79B2238..., DamageMitigationType_26_A9588042... (map, usually empty), IsContainer_13_34FE7C95..., ContainerCapacity_20_DC743D86..., ContainerWeightReduction_37_EDAD1C7B..., InventoryPlaceSound_34_091D6ABA..., SetBonus_47_CB28322D... (RowHandle, e.g. set_makeshift).

E_InventorySlotType - complete DisplayNameMap

Blueprints/Data/E_InventorySlotType.uasset is a UserDefinedEnum; its DisplayNameMap IS accessible (tagged property on the export). Full map:

Enumerator	Display name	Meaning
NewEnumerator0	Hotbar	not an equip slot
NewEnumerator1	InventoryBackpack	not equippable (default for non-equipment)
NewEnumerator2	EquipmentSlots_All	wildcard
NewEnumerator5	EquipmentSlot_Head	helmet
NewEnumerator6	EquipmentSlot_Legs	legs
NewEnumerator7	EquipmentSlot_Backpack	backpack
NewEnumerator12	EquipmentSlot_Arms	arms
NewEnumerator13	EquipmentSlot_Suit	full-body suit
NewEnumerator14	EquipmentSlot_Torso	chest
NewEnumerator15	EquipmentSlot_Headlamp	headlamp
NewEnumerator16	EquipmentSlot_Trinket	trinket (both trinket slots)
NewEnumerator17	EquipmentSlot_Wristwatch	watch
NewEnumerator18	EquipmentSlot_Hacker	keypad hacker
NewEnumerator19	EquipmentSlot_Shield	off-hand shield
NewEnumerator20	EquipmentSlot_Trinket2	second trinket slot (slot id, see note)
NewEnumerator21	EquipmentSlot_Companion	companion pet

Declaration order in the enum asset: 0,1,2,14,5,6,7,12,13,15,16,17,18,19,20,21 - i.e. positions 3.. map 1:1 onto save EquipmentInventory_ indices 0..12 (chest, head, legs, backpack, arms, suit, headlamp, trinket, watch, hacker, shield, trinket2, companion), matching research-transmog-appearance.md.

Observed per-item EquipSlot values

Item id(s)	EquipSlot	Slot
armor_helmet_cqc, armor_helmet_mountaineer	NewEnumerator5	Head
armor_chest_makeshift, armor_chest_forge (39 ids armor_chest*)	NewEnumerator14	Torso/Chest
armor_legs_makeshift, armor_legs_forge (33 ids armor_legs*)	NewEnumerator6	Legs
armor_arms_makeshift, armor_arms_forge (38 ids armor_arms*)	NewEnumerator12	Arms
backpack_large	NewEnumerator7	Backpack
suit_hazmat	NewEnumerator13	Suit
suit_hazmat_casual	NewEnumerator6	Legs(!) - validate per-row, never by id prefix
trinket_kylie	NewEnumerator16	Trinket
heatershield, heatershield_U1, heatershield_U2	NewEnumerator19	Shield
headlamp_default, headlamp_NVG (id family headlamp_*; exact "basic" id is headlamp_default)	NewEnumerator15	Headlamp
headlamp_NVG_t2_broken	NewEnumerator1	not equippable (broken variant)
pocketwatch, watch_stealth, watch_hauling, watch_decoy	NewEnumerator17	Wristwatch
keypad_hacker, keypad_hacker_t2..t5 (exact base id: keypad_hacker)	NewEnumerator18	Hacker
bandage (contrast; "bandage_basic" does not exist)	NewEnumerator1	not equipment

Notes for strict validation:

• Non-equipment items carry EquipSlot = NewEnumerator1 (InventoryBackpack), so "equippable" = EquipSlot ∉ {0,1,2}.
• No item row was observed carrying NewEnumerator20; both trinket UI slots accept items whose EquipSlot is NewEnumerator16. Treat equipment index 11 (Trinket2) as accepting slot-type 16 too.
• armor_*_mountaineer chest/legs/arms do NOT exist; only armor_helmet_mountaineer does.

Q2 - Bench names in the user's real save: VERDICT = data, not a reader bug

• All 26 crafting benches of the live server world live in Worlds/Cascade/WorldSave_Facility.sav (no other region file has any). 9 carry a player-typed name in the deployable struct's top-level CustomTextDisplay_152_B59A50C74001B5D2234D9E9B0D7CAB7F (plain StrProperty, no escapes/control chars): Starter base, Hydroplant, LodeStone, Voussoir, Mario weird, Reactor Underground, Reactor Portal World, Hot Stuff, Chaos. Nothing name-like exists anywhere else in the bench struct (full leaf dump checked; ChangableData_/PlayerMadeString are not involved - those exist only on inventory item slots).
• WorldSaveReader.ReadFromFile on that exact file populates WorldDeployable.CustomName for all 9 (asserted equal in Probe3_ServerBenches_CustomTextDisplay_And_ReaderRoundTrip). The downstream chain (DisplayName -> WorldBaseViewModel.Benches/map labels) all key off CustomName correctly.
• Root cause of "no names in our UI": the checked-in fixture (tests/fixtures/Cascade/WorldSave_Facility.sav) is an older snapshot of the same world in which the same bench GUIDs (e.g. 3CF2D146... = "LodeStone" live) have an EMPTY CustomTextDisplay_. The benches were named after the fixture snapshot was taken. If the app session showed no names, it was reading the stale fixture copy (or a Backups generation), not the live SaveGames/Server/Worlds/Cascade tree.

Q3 - steamid64 inside player saves

Byte-scan + parsed-tree scan of Player_76561197993781479.sav (fixture AND live server copy):

• SaveIdentifier (top-level StrProperty) = "76561197993781479" in both files - the steamid64 IS stored in content, as ASCII digits in a string property near the end of the file (right before SaveVersion). There is no binary uint64 / UTF-16 occurrence, and no separate UniqueID/PlayerID property.
• Incidental: the live server copy also has inventory slot 8's ChangeableData_.../PlayerMadeString_42_CC0B72B2... = the same steamid (a player-renamed/keycard-style item), so don't treat PlayerMadeString hits as identity.

So: player identity = file name AND SaveIdentifier. An editor "clone to other player" feature must rewrite SaveIdentifier, not just rename the file.