trying to rework database migrations

migrations.old/20260130000001_add_rule_to_event.sql

@@ -0,0 +1,61 @@
+-- Migration: Add rule association to event table
+-- This enables events to be directly associated with specific rules,
+-- improving query performance and enabling rule-specific event filtering.
+
+-- Add rule and rule_ref columns to event table
+ALTER TABLE event
+    ADD COLUMN rule BIGINT,
+    ADD COLUMN rule_ref TEXT;
+
+-- Add foreign key constraint
+ALTER TABLE event
+    ADD CONSTRAINT event_rule_fkey
+    FOREIGN KEY (rule) REFERENCES rule(id) ON DELETE SET NULL;
+
+-- Add indexes for efficient querying
+CREATE INDEX idx_event_rule ON event(rule);
+CREATE INDEX idx_event_rule_ref ON event(rule_ref);
+CREATE INDEX idx_event_rule_created ON event(rule, created DESC);
+CREATE INDEX idx_event_trigger_rule ON event(trigger, rule);
+
+-- Add comments
+COMMENT ON COLUMN event.rule IS
+    'Optional reference to the specific rule that generated this event. Used by sensors that emit events for specific rule instances (e.g., timer sensors with multiple interval rules).';
+
+COMMENT ON COLUMN event.rule_ref IS
+    'Human-readable reference to the rule (e.g., "core.echo_every_second"). Denormalized for query convenience.';
+
+-- Update the notify trigger to include rule information if present
+CREATE OR REPLACE FUNCTION notify_event_created()
+RETURNS TRIGGER AS $$
+DECLARE
+    payload JSONB;
+BEGIN
+    -- Build JSON payload with event details
+    payload := jsonb_build_object(
+        'entity_type', 'event',
+        'entity_id', NEW.id,
+        'timestamp', NOW(),
+        'data', jsonb_build_object(
+            'id', NEW.id,
+            'trigger', NEW.trigger,
+            'trigger_ref', NEW.trigger_ref,
+            'rule', NEW.rule,
+            'rule_ref', NEW.rule_ref,
+            'source', NEW.source,
+            'source_ref', NEW.source_ref,
+            'payload', NEW.payload,
+            'created', NEW.created
+        )
+    );
+
+    -- Send notification to the event_created channel
+    PERFORM pg_notify('event_created', payload::text);
+
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+-- Add comment on updated function
+COMMENT ON FUNCTION notify_event_created() IS
+    'Sends PostgreSQL NOTIFY for event creation with optional rule association';