feat: savings allocations

internal/db/migrations/00013_index_allocation_audit_logs.sql

@@ -0,0 +1,15 @@
+-- +goose Up
+-- +goose StatementBegin
+-- Mirror of idx_space_audit_logs_account_id but for allocation.* actions, so
+-- the account-scoped activity feed can OR-merge the two prefixes without a
+-- sequential scan over space_audit_logs.
+
+CREATE INDEX idx_space_audit_logs_allocation_account_id
+    ON space_audit_logs ((metadata->>'account_id'), created_at DESC)
+    WHERE action LIKE 'allocation.%';
+-- +goose StatementEnd
+
+-- +goose Down
+-- +goose StatementBegin
+DROP INDEX IF EXISTS idx_space_audit_logs_allocation_account_id;
+-- +goose StatementEnd