feat: template apply/revert controller for composable Postgres features - #1050
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Ports the dashboard's useApplyComposableTemplate flow: fetch a template's serializedConfig, adjust replica/coordinator/edge counts and edge-variable overrides INSIDE that JSON (raw serde_json so untouched fields round-trip), deploy via templateDeployV2 onto an existing root with stageOnly, then commit the staged patch (honoring --no-deploy via skipDeploys). Conversions take a best-effort pre-conversion safety backup through the public volumeInstanceBackupCreate. Warns when the environment already has staged changes, since committing applies the WHOLE staged patch. Part 4/8 of the railway postgres pitr/ha/pgbouncer stack.
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Part 4/8 of the railway postgres pitr/ha/pgbouncer stack (split out of #1032 for reviewability — see that PR for the full context, live-prod e2e evidence, and the test-postgres-cli harness). Each PR is based on the previous one and is independently green (cargo test/clippy/fmt).
Ports the dashboard's useApplyComposableTemplate flow: fetch a template's
serializedConfig, adjust replica/coordinator/edge counts and edge-variable
overrides INSIDE that JSON (raw serde_json so untouched fields round-trip),
deploy via templateDeployV2 onto an existing root with stageOnly, then
commit the staged patch (honoring --no-deploy via skipDeploys). Conversions
take a best-effort pre-conversion safety backup through the public
volumeInstanceBackupCreate. Warns when the environment already has staged
changes, since committing applies the WHOLE staged patch.
Part 4/8 of the railway postgres pitr/ha/pgbouncer stack.