Fix duplicate session bug for ephys days

[bjhardcastle]

see ephys sessions at end - @samgale:

sessionDf[sessionDf['mouse']==644866].sort_values('date').reset_index()
Out[127]: 
    index                   id   mouse        date  rig  ephys
0     293  644866_2022-11-15_0  644866  2022-11-15   B3  False
1     288  644866_2022-11-16_0  644866  2022-11-16   B3  False
2     285  644866_2022-11-17_0  644866  2022-11-17   B3  False
3     279  644866_2022-11-18_0  644866  2022-11-18   B3  False
4     277  644866_2022-11-21_0  644866  2022-11-21   B3  False
5     272  644866_2022-11-22_0  644866  2022-11-22   B3  False
6     268  644866_2022-11-23_0  644866  2022-11-23   B3  False
7     264  644866_2022-11-28_0  644866  2022-11-28   B3  False
8     260  644866_2022-11-29_0  644866  2022-11-29   B3  False
9     255  644866_2022-11-30_0  644866  2022-11-30   B3  False
10    251  644866_2022-12-01_0  644866  2022-12-01   B3  False
11    248  644866_2022-12-02_0  644866  2022-12-02   B3  False
12    243  644866_2022-12-05_0  644866  2022-12-05   B3  False
13    238  644866_2022-12-06_0  644866  2022-12-06   B3  False
14    234  644866_2022-12-07_0  644866  2022-12-07   B3  False
15    231  644866_2022-12-08_0  644866  2022-12-08   B3  False
16    227  644866_2022-12-09_0  644866  2022-12-09   B3  False
17    223  644866_2022-12-12_0  644866  2022-12-12   B3  False
18    217  644866_2022-12-13_0  644866  2022-12-13   B3  False
19    211  644866_2022-12-14_0  644866  2022-12-14   B3  False
20    207  644866_2022-12-15_0  644866  2022-12-15   B3  False
21    202  644866_2022-12-16_0  644866  2022-12-16   B3  False
22    195  644866_2022-12-19_0  644866  2022-12-19   B3  False
23    191  644866_2022-12-20_0  644866  2022-12-20   B3  False
24    187  644866_2022-12-21_0  644866  2022-12-21   B3  False
25    183  644866_2022-12-22_0  644866  2022-12-22   B3  False
26    178  644866_2023-01-02_0  644866  2023-01-02   B3  False
27    171  644866_2023-01-03_0  644866  2023-01-03   B3  False
28    167  644866_2023-01-04_0  644866  2023-01-04   B3  False
29    163  644866_2023-01-05_0  644866  2023-01-05   B3  False
30    157  644866_2023-01-06_0  644866  2023-01-06   B3  False
31    152  644866_2023-01-09_0  644866  2023-01-09   B3  False
32    148  644866_2023-01-10_0  644866  2023-01-10   B3  False
33    144  644866_2023-01-11_0  644866  2023-01-11   B3  False
34    137  644866_2023-01-12_0  644866  2023-01-12   B3  False
35    134  644866_2023-01-13_0  644866  2023-01-13   B3  False
36    126  644866_2023-01-17_0  644866  2023-01-17   B3  False
37    120  644866_2023-01-18_0  644866  2023-01-18   B3  False
38    117  644866_2023-01-19_0  644866  2023-01-19   B3  False
39    112  644866_2023-01-20_0  644866  2023-01-20   B3  False
40    106  644866_2023-01-23_0  644866  2023-01-23   B3  False
41    100  644866_2023-01-24_0  644866  2023-01-24   B3  False
42     95  644866_2023-01-25_0  644866  2023-01-25  NP3  False
43     89  644866_2023-01-26_0  644866  2023-01-26  NP3  False
44     83  644866_2023-01-27_0  644866  2023-01-27  NP3  False
45     80  644866_2023-01-30_0  644866  2023-01-30  NP3  False
46     75  644866_2023-01-31_0  644866  2023-01-31  NP3  False
47     69  644866_2023-02-01_0  644866  2023-02-01  NP3  False
48     65  644866_2023-02-03_0  644866  2023-02-03  NP3  False
49     58  644866_2023-02-07_0  644866  2023-02-07  NP3  False
50     57  644866_2023-02-07_0  644866  2023-02-07  NP3   True
51     56  644866_2023-02-08_0  644866  2023-02-08  NP3   True
52     55  644866_2023-02-08_0  644866  2023-02-08  NP3  False
53     51  644866_2023-02-09_0  644866  2023-02-09  NP3  False
54     50  644866_2023-02-09_0  644866  2023-02-09  NP3   True
55     48  644866_2023-02-10_0  644866  2023-02-10  NP3  False
56     47  644866_2023-02-10_0  644866  2023-02-10  NP3   True