Initial import: shopdb-flask multi-site asset platform

Flask + Vue rewrite of the classic-ASP shopdb, built as a plugin
framework so sister GE Aerospace sites can adopt it. Product version
0.7.0-pre-0.8.0, plugin contract 0.11.0, 966 backend tests.

Key entry points:
- docs/INSTALL-WINDOWS-IIS.md - tested Windows + IIS install runbook
  (own-site and subpath deployment methods)
- docs/PILOT-DEPLOY.md - production pilot: stand up + import + verify
- docs/IMPORT-API.md - schema-agnostic legacy data import contract
- scripts/site_imports/wjf/ - West Jefferson reference import loader
- docs/adr/ - twelve accepted architecture decision records

migrations/versions/7d25_drop_redundant_indexes.py

@@ -0,0 +1,57 @@
+"""Drop redundant secondary indexes duplicating a named idx_* / unique index.
+
+The DB review found five non-unique secondary indexes that duplicate an existing
+index on the same column: the auto-named ix_* from a column index=True alongside
+a named idx_* in __table_args__ (communications.assetid, and the hostname on
+computers/networkdevices/printers), plus idx_usb_serial duplicating the
+serialnumber unique index on usbdevices. Each redundant pair costs insert/update
+maintenance with zero read benefit. The models had the redundant index source
+removed; this drops the live duplicates so the schema matches the models.
+
+Idempotent (skips a missing table/index); real downgrade recreates them.
+
+Revision ID: 7d25_drop_redundant_indexes
+Revises: 7d24_customfield_searchable
+Create Date: 2026-07-13
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+revision = '7d25_drop_redundant_indexes'
+down_revision = '7d24_customfield_searchable'
+branch_labels = None
+depends_on = None
+
+# (table, index name, columns, unique) - columns/unique used only to recreate on
+# downgrade. All non-unique; the surviving idx_* / unique index still covers each.
+_REDUNDANT = [
+    ('communications', 'ix_communications_assetid', ['assetid'], False),
+    ('computers', 'ix_computers_hostname', ['hostname'], False),
+    ('networkdevices', 'ix_networkdevices_hostname', ['hostname'], False),
+    ('printers', 'ix_printers_hostname', ['hostname'], False),
+    ('usbdevices', 'idx_usb_serial', ['serialnumber'], False),
+]
+
+
+def _index_names(insp, table):
+    return {i['name'] for i in insp.get_indexes(table)}
+
+
+def upgrade():
+    bind = op.get_bind()
+    insp = sa.inspect(bind)
+    tables = set(insp.get_table_names())
+    for table, name, _cols, _unique in _REDUNDANT:
+        if table in tables and name in _index_names(insp, table):
+            op.drop_index(name, table_name=table)
+
+
+def downgrade():
+    bind = op.get_bind()
+    insp = sa.inspect(bind)
+    tables = set(insp.get_table_names())
+    for table, name, cols, unique in _REDUNDANT:
+        if table in tables and name not in _index_names(insp, table):
+            op.create_index(name, table, cols, unique=unique)