QWebHub Database Configuration

All DB config resolution lives in one place: qwebhub/config.py. Modules mounted under the hub defer to this instead of each reading their own db.json, as they did before being unified under QWebHub.

Why this exists

Historically each module resolved db.json from a different path (C:\Users\Robert\Claude\db.json, C:\Users\Robert\db.json, C:\Users\Robert\projects_config\db.json). QWebHub picks ONE resolution order and every mounted module defers to the hub's DATABASES setting — modules keep their own raw-SQL helpers (db.py / connection.cursor()), they just don't read db.json themselves anymore once mounted.

db.json resolution order (first hit wins)

1. QWEBHUB_DB_JSON env var, if set and the file exists.
2. C:\Users\Robert\projects_config\db.json
3. C:\Users\Robert\db.json
4. If none exist: falls back to individual env vars (QWEBHUB_DB_HOST/_PORT/_NAME/_USER/_PASS) so manage.py check and tests can run with no db.json on disk at all.

Two database aliases

qdb_alias(strict=True) — the shared qdb schema (QDBAdmin + QProcess)

Builds DATABASES['default'] from the resolved db.json/env config. With strict=True (the default), it asserts the resolved database value is literally "qdb" and raises ConfigError if not.

Why the strict check exists: db.json is shared across projects, and has in the past silently pointed at the wrong schema (the old rs/RAS schema) for a different project's sake. Failing loudly at startup is deliberate — better than a module silently reading/writing the wrong database. strict=False is only for a throwaway local experiment; don't use it as a routine workaround. QWEBHUB_DB_STRICT=0 (checked via qdb_strict_enabled()) disables the check globally if genuinely needed.

qdgwiki_alias() — the read-only Knowledge Base schema

Same credential source as qdb_alias, but the schema name is hardcoded to "qdgwiki" regardless of what db.json says — so a shared, mutable db.json can never accidentally redirect Knowledge Base reads to the wrong database. Used by the qdgkb module (QDG KB Viewer).

Both aliases set init_command: SET sql_mode='STRICT_TRANS_TABLES' and charset: utf8mb4.

PyMySQL-as-MySQLdb shim

install_pymysql_shim() installs PyMySQL as a drop-in for MySQLdb, once, here — moved from QProcess's own settings.py (which used to do this itself) so it's installed exactly once regardless of which modules are enabled. It also spoofs PyMySQL's reported version to (2, 2, 1, "final", 0) / "2.2.1", because Django's MySQL backend checks Database.__version__ against mysqlclient's versioning scheme (requires >= 2.2.1) — PyMySQL reports its own (lower) version number, which would otherwise fail that check even though PyMySQL works fine as the actual driver.

Shared static/template directory resolution

Also centralized here, for the same "resolve once, not per-module" reason:

• global_static_dirs(projects_root) — finds Global Memory/CSS, Global Memory/Icons, Global Assests/Admin Images if present.
• module_template_dirs(modules) / module_static_dirs(modules) — per enabled module, adds <project_root>/templates and <project_root>/static to Django's search paths (see Architecture for the namespacing rule this depends on).

Related pages

• Architecture — the module registry these aliases and directory helpers plug into.
• Odin Deployment / QWebHub Q&A — credential handling for the FTP deployment path (separate from DB credentials).