1.0.4

Introduced size guard (MAX_QUERY_STACK_DEPTH = 1000)

• When the depth hits the limit we drop the deepest frame before pushing a new one (ExecutorStart).
• Keeps per-backend memory bounded even with runaway recursion.

Memory‐safety fixes

• pg_stack_free() now pfree()-s both the QueryStackEntry and its query_text.
• Limiter path frees the trimmed tail entry.
• Query_Stack_Depth counter added to avoid repeated list_length() scans and guarantee O(1) checks.

Signal/exception robustness

• volatile bool stack_pushed + balanced pop in PG_CATCH ensure no dangling