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#899 — EnsureTags is an upsert, so binding a node to an existing AVEVA tag via historianTagname re-typed/re-described it on every add and host start. - TagConfig `historianReadOnly: true` (TagConfigIntent -> RawTagPlan.HistorianReadOnly): HistoryRead from an existing historian tag that OtOpcUa never provisions and never records into (AddressSpaceApplier.IsOwnedHistorizedValue gates both the EnsureTags hook and the recorder feed). Node-inert: surgical, not mirrored on UNS refs, in the RawTagPlan equality/hash. A non-bool value is the deploy error HistorianReadOnlyInvalid. AdminUI: CSV column HistorianReadOnly (strict), TagHistorizeConfig reads via the runtime parse. - ServerHistorian:ProvisionTags = CreateOrUpdate (default, unchanged) | CreateOnly (Gateway only: TagExistsAsync first, existing tags left alone, failed lookup not sent) | Off. Unknown value / CreateOnly on a SQL backend fail host start. - Default for an explicit historianTagname stays OWNED: overrides pin owned history across renames, a read-only default would silently stop provisioning + recording. #898 — the hook parsed Tag.DataType (an OPC UA name) as DriverDataType, so historized Float/Double/Byte/SByte tags were never provisioned. New shared HistorianDataTypeNames.TryResolve: Float->Float32, Double->Float64, Byte/SByte->Int16 (lossless, provisioned as Int2); unmapped names logged at Information. Gateway now skips Int64/UInt64 (HistorianGateway cannot create Int8/UInt8: lossless-cast-or-reject). UPGRADE: the first host start after this provisions (upserts) every existing historized Float/Double/Byte/SByte tag. Mark foreign-tag bindings historianReadOnly, or set ServerHistorian:ProvisionTags=CreateOnly/Off, before upgrading (docs/Historian.md). Claude-Session: https://claude.ai/code/session_01GT67ACmpMR7b9LGRPLijMi