v0.0.7

Acting on an external review of pgSaci's drop-in experience.

Added

• Preflight diagnostics. On its first backend connection pgSaci logs a
  one-time check of the target database: is orafce installed, what is the
  effective search_path, and does the login user's schema contain any
  upper/mixed-case identifiers an Oracle client can't reach. A missing
  assumption now shows up as one line, not an opaque PostgreSQL error later.
• Session visibility. GET /sessions on the health port returns a JSON
  list of live Oracle sessions (id, addr, user, age_seconds);
  DELETE /sessions/<id> aborts one — dropping its backend PostgreSQL
  connection and releasing any locks it held.
• Idle-reap timeout is logged at startup (default unchanged at 900s).
• Docs: Identifier case (use lower-case identifiers in the target schema),
  Oracle JDBC thin driver (oracle.jdbc.timezoneAsRegion=false), and
  Preflight diagnostics sections in getting-started.

Deliberately not done

• No distinctive "unsupported construct" error — pgSaci stays a best-effort
  text rewriter.
• No case-insensitive catalog identifier resolution — conflicts with the
  stateless text-rewriter design and with Oracle semantics where "no"/"NO"
  coexist; the preflight warning covers the real pain.
• No timestamptz -> DATE wire mode / TZ-region negotiation yet — touches
  result encoding and drops tz precision; documented the workaround instead.

docker pull levyks/pgsaci:0.0.7 — digest sha256:6357a2787e75…, 9.77 MB.