feat: rework organisational unit relations

[stefanprobst]

• governance structure modeled as temporalised relations between organisational units

• status changes mean putting an end date on relation that ended, and creating new relation with new status and start date

• where possible, prefer deriving information and avoid duplication, to minimise data synchronisation problems and data integriy issues

• organisational unit types:

  • eric: dariah-eu
  • governance bodies: general assembly, board of directors, scientific advisory board, senior management team, national coordinators committee, joint research committee, dariah coordination office
  • countries: geopolitical entities (and intergovernmental organisations), can be members/observers in eric in which case an institution acts as national representative entity, and appoints a national coordinating institution
  • national consortia: national grouping of institutions in member/observer countries, lead by national coordinating institution. requires at least one additional institution as member
  • institutions: cooperating partners in non-member/observer countries. partner institutions in member/observer countries - which most often also are members of national consortium but dont have to be if approved by national coordinator
  • working groups: constituted by eric

• allowed relations:

  • governance_body is_part_of eric
  • country is_member_of eric
  • country is_observer_of eric
  • national_consortium is_national_consortium_of country
  • institution is_located_in country
  • institution is_member_of national_consortium
  • institution is_member_of regional_hub
  • institution is_cooperating_partner_of eric
  • institution is_partner_institution_of eric [or country?]
  • institution is_national_coordinating_institution_in eric [or country?]
  • institution is_national_representative_institution_in eric [or country?]
  • working_group is_part_of eric

• derived facts:

  • the national coordinating institution is leading the national consortium if there is one - but we model the relation to national consortium as is_member (not a separate relation type), to avoid having to sync two relations (to the consortium, and to eric)

• modeling questions:

  • is "national coordinating institution" an alternative status to "partner institution" in the relation between institution and eric (nco represents country in operations of dariah). or is a "national coordinating institution" a relation to the country who appoints it, and the same institution counts as a "partner institution" in relation to eric. [symmetry between partner institution and cooperating partner, which must be defined to eric, may be a factor] - similarly national representative entity, which can be modeled in relation to member/observer country it is representing, or directly to eric (general assembly) combined with located_in

• see:

  • https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX%3A32014D0526
  • https://www.dariah.eu/wp-content/uploads/2026/02/DARIAH-ERIC-Statutes-Version-February-2026.pdf
  • https://www.dariah.eu/wp-content/uploads/2024/12/IRP-Version-December-2024.pdf