text: --
  -- Slots represent an n:m relation between revisions and content objects.
  -- A content object can have a specific "role" in one or more revisions.
  -- Each revision can have multiple content objects, each having a different role.
  --
  CREATE TABLE /*_*/slots (
  
    -- reference to rev_id
    slot_revision_id bigint unsigned NOT NULL,
  
    -- reference to role_id
    slot_role_id smallint unsigned NOT NULL CONSTRAINT FK_slots_slot_role FOREIGN KEY REFERENCES slot_roles(role_id),
  
    -- reference to content_id
    slot_content_id bigint unsigned NOT NULL CONSTRAINT FK_slots_content_id FOREIGN KEY REFERENCES content(content_id),
  
    -- The revision ID of the revision that originated the slot's content.
    -- To find revisions that changed slots, look for slot_origin = slot_revision_id.
    slot_origin bigint unsigned NOT NULL,
  
    CONSTRAINT PK_slots PRIMARY KEY (slot_revision_id, slot_role_id)
  );
  
  -- Index for finding revisions that modified a specific slot
  CREATE INDEX /*i*/slot_revision_origin_role ON /*_*/slots (slot_revision_id, slot_origin, slot_role_id);
  