feat: railway postgres ha — high-availability cluster management - #1053
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CLI parity for HA clustering: status (config topology + live Patroni role/state/lag per member over SSH, joined by each node's identity variable -- the postgres-ha template AUTHORS the root's Patroni name), convert (with replica/coordinator/edge count adjustment and a pre-conversion safety backup), revert (gated on the root being the live Patroni leader; sweeps the pre-revert member snapshot plus any role-stamped parentless services afterwards -- the public patch path drops parentServiceId, so live-scaled members are invisible to parent-chain topology), scale (live create/delete of whole member services with wiring restamp; even coordinator counts rejected for quorum), and switchover/promote through Patroni's REST API. Part 7/8 of the railway postgres pitr/ha/pgbouncer stack.
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Part 8/9 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).
CLI parity for HA clustering: status (config topology + live Patroni
role/state/lag per member over SSH, joined by each node's identity
variable -- the postgres-ha template AUTHORS the root's Patroni name),
convert (with replica/coordinator/edge count adjustment and a
pre-conversion safety backup), revert (gated on the root being the live
Patroni leader; sweeps the pre-revert member snapshot plus any role-stamped
parentless services afterwards -- the public patch path drops
parentServiceId, so live-scaled members are invisible to parent-chain
topology), scale (live create/delete of whole member services with wiring
restamp; even coordinator counts rejected for quorum), and
switchover/promote through Patroni's REST API.
Part 8/9 of the railway postgres pitr/ha/pgbouncer stack.