Active Session History arrives in rpg v0.9.0 — /ash charts wait events live and from history

*rpg users can now see what their database is actually waiting on, in real time, with historical depth when pg_ash is installed.*

rpg v0.9.0 adds /ash, a full-screen TUI that renders active sessions as a stacked-bar timeline grouped by wait event type. The interface is interactive — arrow keys scroll and drill down through wait types, events, and individual queries. When the pg_ash extension is installed on the server, @NikolayS's #762 pre-populates the timeline with historical samples from ash.samples on connect, so you see the full picture immediately instead of waiting for live data to accumulate. The zoom level (←→ keys) syncs both the bucket size and the live sampling interval, so coarser views refresh less frequently. The status bar shows the actual data window in seconds — no more guessing whether you're looking at 10 minutes or 600 samples.

sqlever v0.3.0 fixes 10 bugs found by real-world oracle testing against production Sqitch projects

*A real Sqitch deployment with 255 migrations ran byte-for-byte against sqlever. All 10 differences have been fixed.*

sqlever was validated against a production Sqitch project (255 migrations, timescaledb, pgaudit, pg_cron, plpython3u, pgvector) by deploying each migration with both tools side-by-side and comparing change_id values. The oracle test found 10 bugs that unit tests missed: trailing newlines in change IDs, name@tag dependency resolution failures, inline comment parsing in include paths, and others. @NikolayS's #202 adds regression test coverage for all 10 bugs — 43 new tests ensuring they never ship again. Final validation: 255/255 migrations match, zero differences. The v0.3.0 release also includes security hardening (input validation, SQL injection risk fixes) and TypeScript type tightening across the codebase.

multi-host failover now works — rpg follows psql's comma-separated host semantics

*HA setups using Patroni or pgBouncer can now point rpg at multiple hosts and let it find the primary automatically.*

psql supports failover via -h host1,host2,host3, trying each in order until one accepts the connection. rpg did not. @NikolayS's #751 implements the same libpq semantics — connection strings like postgres://host1:5432,host2:5432/db or rpg -h primary,replica -p 5432 now work correctly. Per-host ports are supported (-p 5432,5433), and when all hosts fail, rpg reports which hosts were tried and why each one failed, matching psql's error reporting.

shell commands in prompts — PROMPT1 and PROMPT2 now execute backtick-quoted scripts

*Dynamic prompts like `[`git branch`] %/ #` now work in rpg, matching psql behavior that power users depend on.*

psql allows prompt customization via backtick-delimited shell commands: PROMPT1='hostname:\u@\h:\d> ' executes hostname on each prompt render and substitutes the output. rpg was rendering backticks literally. @NikolayS's #748 adds the same behavior — backticks in PROMPT1 and PROMPT2 are now executed via shell, with stdout trimmed and substituted. Failed commands or empty output substitute an empty string without crashing.