fix(agents): open agy, codex and hermes databases read-only (Issue #64)

.agents/skills/lib_py/agents/adapters/opencode.py

@@ -1,7 +1,6 @@
-import os, sys, sqlite3, shutil, subprocess, tempfile
-from urllib.parse import quote
+import os, sys, sqlite3, shutil, subprocess
 from typing import Optional, Any, List
-from lib_py.agents.base import BaseAgentAdapter, DiscoveryContext, scan_names, db_rows_naming, conversation_in_use
+from lib_py.agents.base import BaseAgentAdapter, DiscoveryContext, _ro_connect, scan_names, db_rows_naming, conversation_in_use
 from lib_py.verify_session import workspace_key
 
 # Tables a 1.x opencode wrote and a migration to 2.x keeps but no longer
@@ -10,31 +9,6 @@ _LEGACY_TABLES = (("message", "session_id"), ("messages", "session_id"), ("part"
                   ("parts", "session_id"), ("todo", "session_id"), ("session_share", "session_id"),
                   ("session", "id"), ("sessions", "id"))
 
-def _ro_connect(db: str):
-    """A read that neither creates nor removes anything beside db (Issue #60).
-    Both WAL sidecars (a live writer keeps them): read through them. No -wal:
-    nothing to apply, so the file is read as immutable. A -wal without its
-    -shm (left behind - no writer runs without one) still holds committed
-    rows: they are read from a private copy, where SQLite may rebuild the
-    index, loaded into memory."""
-    path = os.path.abspath(db)
-    wal, shm = os.path.exists(path + "-wal"), os.path.exists(path + "-shm")
-    if wal and shm:
-        return sqlite3.connect(f"file:{quote(path)}?mode=ro", uri=True)
-    if not wal:
-        return sqlite3.connect(f"file:{quote(path)}?mode=ro&immutable=1", uri=True)
-    mem = sqlite3.connect(":memory:")
-    with tempfile.TemporaryDirectory(prefix="mam-opencode-") as tmp:
-        copy = os.path.join(tmp, "opencode.db")
-        shutil.copyfile(path, copy)
-        shutil.copyfile(path + "-wal", copy + "-wal")
-        src = sqlite3.connect(copy)
-        try:
-            src.backup(mem)
-        finally:
-            src.close()
-    return mem
-
 
 # (binary, HOME, XDG_DATA_HOME) -> the db `debug paths` printed for them.
 _DB_PATHS = {}