printedparts stage 2: models, real 0001 baseline, tables live

PrintedItem (catalog: code, name, image, cached quantityonhand,
per-item threshold, bin) and PrintedItemTransaction (the ledger:
signed quantity change attributed to a badge-resolved employee).
Both registered in PLUGIN_TABLE_OWNERS; 0001 is a post-cutover real
baseline. The migration-guard test learns the new expected head.
Routes are a placeholder ping until the next stage - the scaffold's
list route imported the deleted scaffold model, which surfaces as an
empty 'Migration error' because the alembic env imports the models
package.

plugins/printedparts/migrations/env.py

@@ -0,0 +1,14 @@
+"""Alembic environment for the printedparts plugin migration chain.
+
+Delegates to the shared runner in shopdb.plugins.alembic_template, which
+filters the metadata to this plugin's tables and drives Alembic against the
+per-plugin version table alembic_version_printedparts (ADR-008). This plugin
+is NEW (post-cutover): its 0001 baseline really CREATES its tables.
+"""
+import os
+
+os.environ['PLUGIN_NAME'] = 'printedparts'
+
+from shopdb.plugins.alembic_template import run_migrations  # noqa: E402
+
+run_migrations()

plugins/printedparts/migrations/script.py.mako

@@ -0,0 +1,24 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+branch_labels = ${repr(branch_labels)}
+depends_on = ${repr(depends_on)}
+
+
+def upgrade():
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade():
+    ${downgrades if downgrades else "pass"}

plugins/printedparts/migrations/versions/0001_printedparts_baseline.py

@@ -0,0 +1,71 @@
+"""printedparts plugin baseline (real create).
+
+Post-ADR-008 plugin: this per-plugin chain is the sole authoritative creator
+of printeditems and printeditemtransactions - the core chain never knew them.
+Runs from `flask plugin install printedparts` (and `flask plugin upgrade-all`)
+after `flask db upgrade` builds the core schema.
+
+Both tables are self-contained (the only FK is transactions -> items inside
+the plugin), so the shared create_plugin_tables helper would work here; the
+ops are written out explicitly anyway to match the measuringtools exemplar
+and keep the baseline reviewable.
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = 'printedparts0001baseline'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    op.create_table(
+        'printeditems',
+        sa.Column('printeditemid', sa.Integer(), nullable=False),
+        sa.Column('itemcode', sa.String(length=20), nullable=True),
+        sa.Column('itemname', sa.String(length=120), nullable=False),
+        sa.Column('itemdescription', sa.String(length=500), nullable=True),
+        sa.Column('imageurl', sa.String(length=255), nullable=True),
+        sa.Column('quantityonhand', sa.Integer(), nullable=False),
+        sa.Column('lowstockthreshold', sa.Integer(), nullable=False),
+        sa.Column('binlocation', sa.String(length=100), nullable=True),
+        sa.Column('printnotes', sa.Text(), nullable=True),
+        sa.Column('createddate', sa.DateTime(), nullable=False),
+        sa.Column('modifieddate', sa.DateTime(), nullable=False),
+        sa.Column('isactive', sa.Boolean(), nullable=False),
+        sa.PrimaryKeyConstraint('printeditemid'),
+        sa.UniqueConstraint('itemcode'),
+    )
+    op.create_index('ix_printeditems_itemcode', 'printeditems', ['itemcode'])
+
+    op.create_table(
+        'printeditemtransactions',
+        sa.Column('transactionid', sa.Integer(), nullable=False),
+        sa.Column('printeditemid', sa.Integer(), nullable=False),
+        sa.Column('transactiontype', sa.String(length=10), nullable=False),
+        sa.Column('quantitychange', sa.Integer(), nullable=False),
+        sa.Column('employeesso', sa.String(length=20), nullable=False),
+        sa.Column('employeename', sa.String(length=120), nullable=True),
+        sa.Column('reason', sa.String(length=255), nullable=True),
+        sa.Column('transactiondate', sa.DateTime(), nullable=False),
+        sa.Column('createddate', sa.DateTime(), nullable=False),
+        sa.Column('modifieddate', sa.DateTime(), nullable=False),
+        sa.Column('isactive', sa.Boolean(), nullable=False),
+        sa.ForeignKeyConstraint(['printeditemid'], ['printeditems.printeditemid'],
+                                ondelete='CASCADE'),
+        sa.PrimaryKeyConstraint('transactionid'),
+    )
+    op.create_index('ix_printeditemtransactions_printeditemid',
+                    'printeditemtransactions', ['printeditemid'])
+    op.create_index('ix_printeditemtransactions_employeesso',
+                    'printeditemtransactions', ['employeesso'])
+    op.create_index('ix_printeditemtransactions_transactiondate',
+                    'printeditemtransactions', ['transactiondate'])
+
+
+def downgrade():
+    op.drop_table('printeditemtransactions')
+    op.drop_table('printeditems')