A run can contain zero, one, or N agent_task steps. A single
agent_session_id at the run level holds at most one of them, so the
column is the wrong shape for the data.
Per-step session ids (LangGraph thread/checkpoint reference for an
agent_task step) live inside step_results[i] alongside the rest of
the per-step bag (status, timings, output). Each agent step records
its own; non-agent steps record nothing. Run-level "primary session"
is a UI concern, not a schema concern.
Trade-off: trace -> run reverse lookup is now a JSONB query, not an
index hit. Usually traversal goes run -> trace; if the reverse
becomes hot we add a GIN index on step_results or a generated
column — both additive.
Changes:
- AutomationRun: drop the agent_session_id column; module docstring
notes where per-step session ids now live.
- Migration 144: drop the column from the CREATE TABLE; downgrade
unchanged.
Safe to edit migration 144 in place (vs. add 145 with ALTER ... DROP):
this branch has not shipped and the table has never existed in any
deployed database.
Migration 144 -> 143. Matches the SQLAlchemy models added in commit 7
and the v1 data model in automation-design-plan.md §9.
Up:
- CREATE TYPE automation_status / automation_trigger_type /
automation_run_status (PostgreSQL ENUMs created first because the
tables reference them).
- CREATE TABLE automations with FK to searchspaces (CASCADE) and
user (SET NULL); five indexes matching the SQLAlchemy model.
- CREATE TABLE automation_triggers with FK to automations
(CASCADE); four indexes.
- CREATE TABLE automation_runs with FK to automations (CASCADE) and
automation_triggers (SET NULL — null trigger_id == manual via UI);
four indexes.
Down: drops every index, table, and ENUM in reverse-dependency order
so the migration is reversible without ON DELETE side effects.
Verified: `alembic history` resolves 143 -> 144 (head) cleanly.
domain_events (Phase 3) and mcp_connections / mcp_tools (Phase 4) ship
in their own migrations when the consuming feature lands; this
migration only covers the three v1 tables.
