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Strange activity of prepared queries

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Hi!
I have pgBadger report with strange data about prepared queries I cannot
interpret by myself. If anybody could help me with interpretation, would be
greatly appreciated.
In first half of the day pgBadger shows there is no prepare statements and
all queries are binded - how is that possible if average duration of session
is only 4m16s, not 15 hours?

Hour	Prepare	Bind	Bind/Prepare	Percentage of prepare
0	0	4,059	4,059.00	0.00%
1	0	341	341.00	0.00%
2	0	8	8.00	0.00%
3	0	16	16.00	0.00%
4	0	28	28.00	0.00%
5	0	6	6.00	0.00%
6	0	350	350.00	0.00%
7	0	2,35	2,350.00	0.00%
8	0	1,999	1,999.00	0.00%
9	0	2,383	2,383.00	0.00%
10	3	870	290.00	0.34%
11	0	1,941	1,941.00	0.00%
12	2	1,397	698.50	0.14%
13	0	798	798.00	0.00%
14	0	1,445	1,445.00	0.00%
15	1,707,090	1,707,503	1.00	99.93%
16	2,133,960	2,134,001	1.00	99.94%
17	1,793,804	1,793,851	1.00	99.93%
18	1,745,064	1,745,095	1.00	99.94%
19	1,067,248	1,067,288	1.00	99.90%
20	937,137	937,142	1.00	99.88%
21	596,606	596,603	1.00	34.43%
22	711,941	711,945	1.00	58.58%
23	816,353	816,37	1.00	99.86%




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