fix(sql): Correct storage partition rebuild functions

[devsjc]

Slightly modifies the functions used to rebuild the partitions.

[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":"2026-08-12T08:57:24Z","message":"Completed migrations"}
goos: linux
goarch: amd64
pkg: github.com/openclimatefix/data-platform/internal/server/postgres
cpu: AMD EPYC 7763 64-Core Processor                
BenchmarkPostgresClient/small/GetForecastAsTimeseries-4         	     115	   9523277 ns/op
BenchmarkPostgresClient/small/GetForecastAtTimestamp-4          	     296	   3875763 ns/op
BenchmarkPostgresClient/small/GetObservationsAsTimeseries-4     	     890	   1302198 ns/op
BenchmarkPostgresClient/small/CreateForecast-4                  	     106	  10928198 ns/op
BenchmarkPostgresClient/small/StreamForecastData-4              	      25	  45238556 ns/op
PASS
ok  	github.com/openclimatefix/data-platform/internal/server/postgres	66.586s
?   	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: AMD EPYC 7763 64-Core Processor                
                                                   │ bench-main.txt │  bench-devsjc-fix-migration-12.txt   │
                                                   │     sec/op     │    sec/op     vs base                │
PostgresClient/small/GetForecastAsTimeseries-4         8.924m ± ∞ ¹   9.523m ± ∞ ¹       ~ (p=1.000 n=1) ²
PostgresClient/small/GetForecastAtTimestamp-4          3.970m ± ∞ ¹   3.876m ± ∞ ¹       ~ (p=1.000 n=1) ²
PostgresClient/small/GetObservationsAsTimeseries-4     1.243m ± ∞ ¹   1.302m ± ∞ ¹       ~ (p=1.000 n=1) ²
PostgresClient/small/CreateForecast-4                  12.76m ± ∞ ¹   10.93m ± ∞ ¹       ~ (p=1.000 n=1) ²
PostgresClient/small/StreamForecastData-4              45.73m ± ∞ ¹   45.24m ± ∞ ¹       ~ (p=1.000 n=1) ²
geomean                                                7.620m         7.502m        -1.55%
¹ need >= 6 samples for confidence interval at level 0.95
² need >= 4 samples to detect a difference at alpha level 0.05