feat(memory): FTS5 index for graph entities (#1232)#1254
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Add FTS5 full-text search index for graph_entities table, replacing LIKE '%query%' with FTS5 MATCH + bm25 ranking in find_entities_fuzzy. - Migration 023_graph_entities_fts5.sql: FTS5 virtual table with unicode61 tokenizer (remove_diacritics=2), content-sync triggers (INSERT/DELETE/UPDATE), and backfill from existing entities - find_entities_fuzzy: FTS5 MATCH with prefix wildcards, bm25 ranking (name 10x weight over summary), FTS5 operator filtering (AND/OR/NOT/NEAR) - Reuse sanitize_fts5_query from messages module (pub(crate)) - 7 new tests (+1 during review fixes), test count 4244 -> 4251 Closes #1232
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Resolve conflicts in CHANGELOG.md, README.md, and docs/src/concepts/graph-memory.md — keep both branches' additions.
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Summary
graph_entitiestable (migration023_graph_entities_fts5.sql)LIKE '%query%'with FTS5 MATCH + bm25 ranking infind_entities_fuzzysanitize_fts5_queryfrom messages module, add FTS5 operator filtering (AND/OR/NOT/NEAR)remove_diacritics=2, name column weighted 10x over summarygraph_entitiesfind_entities_fuzzysignature unchangedBehavioral change: FTS5 prefix matching replaces LIKE substring matching. Searching "SQL" matches "SQLite" (prefix) but not "GraphQL" (mid-word substring). Documented in code and CHANGELOG.
Test plan
--features full)cargo +nightly fmt --checkcleancargo clippy --workspace --features full -- -D warningscleanFollow-up issues
last_seen_at-only changesfind_entities_fuzzyretrieval.rsper-word loop to pass full query to FTS5 nativelyCloses #1232
Part of #1222