fc-common: add jobset state enum; add db migration"

I'm going to delete all migrations one of those days...

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: I8e2e32118c2d85438a8b343614038eda6a6a6964

crates/common/migrations/011_jobset_states.sql

@@ -0,0 +1,39 @@
+-- Migration: Add jobset states for Hydra-compatible scheduling
+-- Supports 4 states: disabled, enabled, one_shot, one_at_a_time
+
+-- Add state column with CHECK constraint
+ALTER TABLE jobsets ADD COLUMN state VARCHAR(50) NOT NULL DEFAULT 'enabled'
+    CHECK (state IN ('disabled', 'enabled', 'one_shot', 'one_at_a_time'));
+
+-- Migrate existing data based on enabled column
+UPDATE jobsets SET state = CASE WHEN enabled THEN 'enabled' ELSE 'disabled' END;
+
+-- Add last_checked_at for per-jobset interval tracking
+ALTER TABLE jobsets ADD COLUMN last_checked_at TIMESTAMP WITH TIME ZONE;
+
+-- Drop and recreate active_jobsets view to include new columns
+DROP VIEW IF EXISTS active_jobsets;
+CREATE VIEW active_jobsets AS
+SELECT
+    j.id,
+    j.project_id,
+    j.name,
+    j.nix_expression,
+    j.enabled,
+    j.flake_mode,
+    j.check_interval,
+    j.branch,
+    j.scheduling_shares,
+    j.created_at,
+    j.updated_at,
+    j.state,
+    j.last_checked_at,
+    p.name as project_name,
+    p.repository_url
+FROM jobsets j
+JOIN projects p ON j.project_id = p.id
+WHERE j.state IN ('enabled', 'one_shot', 'one_at_a_time');
+
+-- Indexes for efficient queries
+CREATE INDEX idx_jobsets_state ON jobsets(state);
+CREATE INDEX idx_jobsets_last_checked_at ON jobsets(last_checked_at);