fix: --from including extra chunks

[alejandrodnm]

When using from and until parameters to find chunks in the source, we added a WHERE statement to filter chunks based on these conditions:

• For chunk.range_start < until, we match chunks that start before the completion point. But if range_start of a chunk equals the until value, the chunk is ignored since until is exclusive and this chunk is outside the backfill range.

• For from <= chunk.range_end, we match chunks that end after or at the backfill start. But when range_end equals from value, this chunk should be ignored, because range_end is exclusive and the chunk falls outside the desired range.

Consider the chunks as [start-end) ranges:

[0-2)[2-4)

With `from=2`
from=2 = range_end_chunk_1=2
from=2 < range_end_chunk_2=4

The current statement from <= chunk.range_end incorrectly matches both chunks. The first chunk doesn't have a time value inside the backfill period because max(time) < range_end inside a chunk.

To fix this, we remove the equality from the second condition and match only when from is less than chunk.range_end.

[alejandrodnm]

I'll add a test to check that we are getting just one chunk

[JamesGuthrie]

Can you explain somewhere what it was that we got wrong in the previous implementation?

[alejandrodnm]

Can you explain somewhere what it was that we got wrong in the previous implementation?

done