phase 14-15: docker build validation and helm deployment

infra/migrations/012_audit_trail_indexes.sql

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+-- Stonks Oracle - Execution audit trail indexes
+-- Supports efficient querying of the full decision chain from
+-- recommendation through risk evaluation to broker execution.
+-- Requirements: 8.3, 11.3
+
+-- GIN index on audit_events.data for JSONB key lookups
+-- (e.g. data->>'recommendation_id', data->>'order_id')
+CREATE INDEX IF NOT EXISTS idx_audit_events_data_gin
+    ON audit_events USING gin (data);
+
+-- Index for chronological audit trail queries by entity
+CREATE INDEX IF NOT EXISTS idx_audit_events_entity_created
+    ON audit_events (entity_id, created_at ASC);
+
+-- Index for filtering by event_type + entity_type
+CREATE INDEX IF NOT EXISTS idx_audit_events_type_entity
+    ON audit_events (event_type, entity_type);