fix(sql): Partition pruning in deltas sql

[devsjc]

No description provided.

[github-actions]

Benchmark Results

Benchmark results

?   	github.com/openclimatefix/data-platform/cmd	[no test files]
?   	github.com/openclimatefix/data-platform/internal/gen/ocf/dp	[no test files]
?   	github.com/openclimatefix/data-platform/internal/interceptors	[no test files]
PASS
ok  	github.com/openclimatefix/data-platform/internal/server/dummy	0.005s
{"level":"debug","time":"2026-03-31T15:15:26Z","message":"Completed migrations"}
goos: linux
goarch: amd64
pkg: github.com/openclimatefix/data-platform/internal/server/postgres
cpu: Intel(R) Xeon(R) Platinum 8370C CPU @ 2.80GHz
BenchmarkPostgresClient/small/GetForecastAsTimeseries-4         	      62	  18070530 ns/op
BenchmarkPostgresClient/small/GetForecastAtTimestamp-4          	     308	   3721634 ns/op
BenchmarkPostgresClient/small/GetObservationsAsTimeseries-4     	    1129	   1016691 ns/op
BenchmarkPostgresClient/small/CreateForecast-4                  	      98	  11863633 ns/op
PASS
ok  	github.com/openclimatefix/data-platform/internal/server/postgres	64.517s
?   	github.com/openclimatefix/data-platform/internal/server/postgres/gen	[no test files]

Benchmark vs base branch

goos: linux
goarch: amd64
pkg: github.com/openclimatefix/data-platform/internal/server/postgres
cpu: Intel(R) Xeon(R) Platinum 8370C CPU @ 2.80GHz
                                                   │ bench-main.txt │     bench-devsjc-deltas-fix.txt      │
                                                   │     sec/op     │    sec/op     vs base                │
PostgresClient/small/GetForecastAsTimeseries-4         16.06m ± ∞ ¹   18.07m ± ∞ ¹       ~ (p=1.000 n=1) ²
PostgresClient/small/GetForecastAtTimestamp-4          3.655m ± ∞ ¹   3.722m ± ∞ ¹       ~ (p=1.000 n=1) ²
PostgresClient/small/GetObservationsAsTimeseries-4     1.020m ± ∞ ¹   1.017m ± ∞ ¹       ~ (p=1.000 n=1) ²
PostgresClient/small/CreateForecast-4                  10.88m ± ∞ ¹   11.86m ± ∞ ¹       ~ (p=1.000 n=1) ²
geomean                                                5.051m         5.337m        +5.65%
¹ need >= 6 samples for confidence interval at level 0.95
² need >= 4 samples to detect a difference at alpha level 0.05