It has been harder to meet the performance goals of the original design than was anticipated (more specifically, database query throughput for light-curve retrieval simultaneous with dense record insertion).
We have built a functional prototype, but only to a limited scale. Discussion is needed to decide whether requirements should be relaxed (light curve query latencies and/or insertion latencies), or whether the requirements as currently stated hold and we should continue to search for a breakthrough in implementation.
An additional factor in the delay of completion of this milestone was that the primary developer (Andy S) was re-assigned to SuperTask work items which were perceived to have hight priority since the L1/AP db was not at that time on the critical path.
Note, EPO has dependency on that milestone (Nightly transfers (LSE-131, 2.5,8 & LSE-89 1.1.2-3,3.8)), so we should make it a Level 2 milestone.