Acceptance criteria:

• Configuration Migration (Btree to Connection Level):
  • disaggregated.delta_pct configuration is successfully migrated from btree-level scope to connection-level scope.
  • disaggregated.max_consecutive_delta configuration is successfully migrated from btree-level scope to connection-level scope.
  • Corresponding tests for disaggregated.delta_pct and disaggregated.max_consecutive_delta are updated to correctly utilize their new connection-level configuration.

• Page Delta Configuration Consolidation:
  • Move all five page delta configurations (delta_pct, max_consecutive_delta, internal_page_delta, leaf_page_delta, flatten_leaf_page_delta) into a new, dedicated page_delta category under the connection level.

• Structure Refactoring:
  • Create a separate structure WT_PAGE_DELTA and store all the Page delta-related member variables within a new structure.
  • These page delta member variables will no longer be stored within the WT_DISAGGREGATED_STORAGE structure.