§22.13 step 1: default-project-id re-stamp (v0.39.0)

projects.restamp_default_project(config): at startup after the registry mirror,
renames project_id from the M1 bootstrap 'default' to the configured
DEFAULT_PROJECT_ID across every project-scoped table (discovered by column) and
drops the stale 'default' projects row, so a deployment's original corpus lands
at a meaningful /p/<id>/ and 'default' is never a public URL. FK off for the
rename (parent+children move together) + foreign_key_check backstop. Idempotent;
no-op unless DEFAULT_PROJECT_ID is set to a non-'default' value.

test_restamp_default_project.py (3 tests). 450 backend green.

This is the last framework piece for OHM's clean /p/ohm/ cutover.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

backend/app/projects.py

@@ -7,9 +7,13 @@ the registry mirror (`registry.refresh_registry`) is authoritative.
 """
 from __future__ import annotations
 
+import logging
+
 from . import db
 from .config import Config
 
+log = logging.getLogger(__name__)
+
 DEFAULT_PROJECT_ID = "default"
 
 
@@ -20,6 +24,71 @@ def resolved_default_id(config: Config) -> str:
     return config.default_project_id.strip() or DEFAULT_PROJECT_ID
 
 
+def restamp_default_project(config: Config) -> None:
+    """§22.13 step 1 — one-time rename of the M1 bootstrap project id
+    (DEFAULT_PROJECT_ID = 'default') to the deployment's configured default id
+    (the DEFAULT_PROJECT_ID env var, e.g. 'ohm'), so the deployment's original
+    corpus lands at a meaningful `/p/<id>/` and `default` is never a public URL.
+
+    Renames `project_id` across every project-scoped table (discovered by
+    column, so it stays correct as the schema grows), then drops the stale
+    bootstrap `projects` row (its data has moved to the configured row, which
+    the registry mirror already created). Idempotent and a no-op when the
+    configured id is still 'default' or no bootstrap rows remain. Runs at
+    startup after the registry mirror, with FK enforcement off for the rename
+    (the composite FKs are kept consistent because parent and child rows are
+    renamed together) and a foreign_key_check backstop before commit.
+    """
+    target = resolved_default_id(config)
+    if target == DEFAULT_PROJECT_ID:
+        return
+    conn = db.conn()
+    has_rows = conn.execute(
+        "SELECT 1 FROM cached_rfcs WHERE project_id = ? LIMIT 1", (DEFAULT_PROJECT_ID,)
+    ).fetchone()
+    stale_proj = conn.execute(
+        "SELECT 1 FROM projects WHERE id = ? LIMIT 1", (DEFAULT_PROJECT_ID,)
+    ).fetchone()
+    if not has_rows and not stale_proj:
+        return
+    if conn.execute("SELECT 1 FROM projects WHERE id = ? LIMIT 1", (target,)).fetchone() is None:
+        log.warning("restamp: target project %r not in registry yet; skipping", target)
+        return
+
+    tables = [r["name"] for r in conn.execute("SELECT name FROM sqlite_master WHERE type='table'")]
+    pid_tables = [
+        t for t in tables
+        if any(c["name"] == "project_id" for c in conn.execute(f"PRAGMA table_info({t})"))
+    ]
+    conn.execute("PRAGMA foreign_keys = OFF")
+    try:
+        conn.execute("BEGIN")
+        for t in pid_tables:
+            conn.execute(
+                f"UPDATE {t} SET project_id = ? WHERE project_id = ?",
+                (target, DEFAULT_PROJECT_ID),
+            )
+        # The bootstrap row's data has moved to the configured (registry) row.
+        conn.execute("DELETE FROM projects WHERE id = ?", (DEFAULT_PROJECT_ID,))
+        violations = conn.execute("PRAGMA foreign_key_check").fetchall()
+        if violations:
+            conn.execute("ROLLBACK")
+            raise RuntimeError(
+                f"restamp left foreign-key violations: {[tuple(v) for v in violations]}"
+            )
+        conn.execute("COMMIT")
+    except Exception:
+        try:
+            conn.execute("ROLLBACK")
+        except Exception:
+            pass
+        raise
+    finally:
+        conn.execute("PRAGMA foreign_keys = ON")
+    log.info("restamp: renamed bootstrap project %r -> %r across %d tables",
+             DEFAULT_PROJECT_ID, target, len(pid_tables))
+
+
 def default_content_repo(config: Config) -> str | None:
     """The content repo the single-corpus mirror reads, from the default
     project's row (filled by the registry mirror). Replaces the retired