Initial commit: rustytokens — native codebase indexer + MCP server

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/index/schema.rs

@@ -0,0 +1,71 @@
+//! SQLite schema + minimal migration (schema_version in metadata).
+
+use anyhow::Result;
+use rusqlite::Connection;
+
+const SCHEMA_VERSION: i64 = 1;
+
+const SCHEMA: &str = r#"
+CREATE TABLE files (
+  id INTEGER PRIMARY KEY,
+  path TEXT NOT NULL UNIQUE,
+  content_hash TEXT NOT NULL,
+  language TEXT NOT NULL,
+  mtime INTEGER NOT NULL
+);
+CREATE TABLE symbols (
+  id INTEGER PRIMARY KEY,
+  file_id INTEGER NOT NULL REFERENCES files(id) ON DELETE CASCADE,
+  name TEXT NOT NULL,
+  qualified_name TEXT NOT NULL,
+  kind TEXT NOT NULL,
+  signature TEXT,
+  line_start INTEGER NOT NULL,
+  line_end INTEGER NOT NULL
+);
+CREATE INDEX idx_symbols_file ON symbols(file_id);
+CREATE INDEX idx_symbols_name ON symbols(name);
+CREATE TABLE imports (
+  id INTEGER PRIMARY KEY,
+  from_file_id INTEGER NOT NULL REFERENCES files(id) ON DELETE CASCADE,
+  to_file_id INTEGER NOT NULL REFERENCES files(id) ON DELETE CASCADE,
+  import_type TEXT NOT NULL
+);
+CREATE INDEX idx_imports_from ON imports(from_file_id);
+CREATE INDEX idx_imports_to ON imports(to_file_id);
+CREATE VIRTUAL TABLE symbols_fts USING fts5(
+  name, qualified_name, kind, signature,
+  content='symbols', content_rowid='id'
+);
+CREATE TRIGGER symbols_ai AFTER INSERT ON symbols BEGIN
+  INSERT INTO symbols_fts(rowid, name, qualified_name, kind, signature)
+  VALUES (new.id, new.name, new.qualified_name, new.kind, new.signature);
+END;
+CREATE TRIGGER symbols_ad AFTER DELETE ON symbols BEGIN
+  INSERT INTO symbols_fts(symbols_fts, rowid, name, qualified_name, kind, signature)
+  VALUES ('delete', old.id, old.name, old.qualified_name, old.kind, old.signature);
+END;
+CREATE VIRTUAL TABLE content_fts USING fts5(path UNINDEXED, content);
+"#;
+
+/// Create schema if missing, or migrate to the current version.
+pub fn init(conn: &mut Connection) -> Result<()> {
+    conn.execute_batch(
+        "CREATE TABLE IF NOT EXISTS metadata (key TEXT PRIMARY KEY, value TEXT NOT NULL);",
+    )?;
+    let version: i64 = conn
+        .query_row(
+            "SELECT COALESCE(CAST(value AS INTEGER), 0) FROM metadata WHERE key='schema_version'",
+            [],
+            |r| r.get(0),
+        )
+        .unwrap_or(0);
+    if version < SCHEMA_VERSION {
+        conn.execute_batch(SCHEMA)?;
+        conn.execute(
+            "INSERT OR REPLACE INTO metadata (key, value) VALUES ('schema_version', ?1)",
+            [SCHEMA_VERSION.to_string()],
+        )?;
+    }
+    Ok(())
+}