The flow load the database serves, by its table comment

wet can reload discharge.fwa_v1_segment_monthly between two runs (NewGraphEnvironment/wet#103 did on 2026-10-19), and the table's comment names the build. A grade records it, a publish compares it, and the walk cache keys every row on its md5 (#72, #87). Refuses a table with no comment.

Usage

knw_discharge_load(conn)

Arguments

conn

a DBI connection to a database holding discharge.

Value

character(1), the comment.

Details

wet writes one comment per table, naming only the scenario loaded last, and the walk and the grade read only historical. Once another scenario is loaded, the comment no longer names the historical rows' build, so two different historical loads could share it and the walk cache would serve walks made on the older one. So this refuses a comment that does not name scenario historical.

Examples

if (FALSE) { # \dontrun{
conn <- DBI::dbConnect(RPostgres::Postgres())
knw_discharge_load(conn)
} # }