feat: migrate index DB to global ~/.codecora/cora-code/graph.db#355
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…de/graph.db with project_id scoping BREAKING CHANGE: index database moved from .cora/index.db (per-project) to ~/.codecora/cora-code/graph.db (global). Schema v2 adds projects table with project_id FK on files, symbols, and call_graph tables. All queries now scoped by project_id. - Add data_dir module: resolves ~/.codecora/cora-code/graph.db with CODECORA_DATA_DIR env override - Add schema v2 migration: projects table, project_id FK on files/symbols/call_graph (CASCADE) - Replace open_index()/default_db_path() with open_global_index() returning (Connection, project_id) - Update all index functions (search, index_stats, prune_deleted, find_callers, find_callees, impact_analysis, clear_edges_for_file, store_edges) to accept project_id - Update all CLI commands (Index, Explore, Callers, Impact, Affected) to use global index - Update all MCP tools to use global index with project scoping - Remove dead code (open_index, resolve_project_root) - Add CodeCora Data Directory Standard doc - All 703 tests pass, 0 clippy warnings
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Summary
Migrate the symbol index database from per-project ".cora/index.db" to a global shared database at "~/.codecora/cora-code/graph.db" with
project_idforeign key scoping.Changes
Architecture
~/.codecora/cora-code/graph.dbprojectstable withproject_idFK onfiles,symbols,call_graph(CASCADE on delete)ensure_project()Files
src/data_dir.rs~/.codecora/cora-code/graph.db,CODECORA_DATA_DIRenv overridesrc/index/schema.rsget_or_create_project(),delete_project()src/index/mod.rsopen_global_index()→(Connection, i64), all fns acceptproject_idsrc/index/graph.rsfind_callers,find_callees,impact_analysis,store_edges,clear_edges_for_filescoped byproject_idsrc/index/symbols.rssearch,like_search,filter_searchscoped byproject_idsrc/main.rssrc/mcp/tools.rsdocs/standards/Breaking Change
Existing per-project
.cora/index.dbfiles will be ignored — users need to re-index (cora index --rebuild) after upgrade. This is acceptable since the index feature is Phase 2/pre-stable.Validation
cargo check— 0 errors, 0 warningscargo clippy— cleancargo test— 703 passed, 0 failed