Merge remote-tracking branch 'origin/main' into sprint-37/server

# Conflicts:
#	CHANGELOG.md
#	Makefile
#	server/data/systems.db

server/data/systems-schema.sql

@@ -480,6 +480,23 @@ CREATE INDEX IF NOT EXISTS idx_corps_type ON corporations(corp_type);
 CREATE INDEX IF NOT EXISTS idx_star_systems_currency ON star_systems(currency_zone);
 CREATE INDEX IF NOT EXISTS idx_gate_links_from ON gate_links(from_system_id);
 CREATE INDEX IF NOT EXISTS idx_gate_links_to ON gate_links(to_system_id);
+
+-- Generator metadata stamp (#855, #856)
+-- One row per generator, updated on each successful non-dry-run.
+-- schema_version: SHA-1 of server/data/systems-schema.sql content at generation time
+-- generator_sha:  SHA-1 of the generator source file(s) content
+-- generated_at:   ISO-8601 UTC timestamp of the run
+--
+-- Used by:
+--   tooling/check-systems-db-stamp — verifies freshness before push (#857)
+--   .config/hooks/pre-push         — rejects pushes with stale DB (#857)
+--   /pr-push skill                 — triggers make regen-db if stale (#858)
+CREATE TABLE IF NOT EXISTS meta (
+    generator_name TEXT PRIMARY KEY,  -- 'import_economics' | 'generate_atlas' | 'generate_brands'
+    schema_version TEXT NOT NULL,     -- SHA-1 hex of systems-schema.sql content
+    generator_sha TEXT NOT NULL,      -- SHA-1 hex of generator source file(s) content
+    generated_at TEXT NOT NULL DEFAULT (datetime('now'))
+);
 CREATE INDEX IF NOT EXISTS idx_commodities_tier ON commodities(tier);
 CREATE INDEX IF NOT EXISTS idx_production_chains_output ON production_chains(output_commodity_id);
 CREATE INDEX IF NOT EXISTS idx_chain_inputs_commodity ON chain_inputs(input_commodity_id);