Moved timestamp from snapshot to result.

This patch moves the timestamp attribute from
the snapshot table to the result table. This
is done for two purposes:

1) Retrieving a pure result history (not including the
SHA-1 values) becomes quicker, since a join is avoided
(simply fetch all (timestamp, value) pairs matching a
given BM context).

2) It constitutes the first of two steps towards supporting
multiple result recordings per (SHA-1, BM context)
combination (the other step will be to remove the current
uniqueness constraint on that combination!).
The (future) use case is to improve statistical confidence
by e.g. taking the median value of the set of values for
a certain (SHA-1, BM context) combination as the representative
value for the combination.

1 files changed, 0 insertions, 0 deletions

diff --git a/doc/er-diagram.dia b/doc/er-diagram.dia
index a860b22..22bd8f9 100644
--- a/doc/er-diagram.dia
+++ b/doc/er-diagram.dia