Jul 9 - Chat - Add knowledge base for AI training

migrations/versions/phase38_support_knowledge.py

@@ -0,0 +1,46 @@
+"""phase38 — support_knowledge (admin-curated AI chat knowledge base)
+
+Admin-editable knowledge entries injected into the support chatbot's system
+prompt so staff can improve its app knowledge without code changes.
+
+Uses table existence check — safe to re-run.
+"""
+
+revision      = 'phase38_support_knowledge'
+down_revision = 'phase37_support_chat'
+branch_labels = None
+depends_on    = None
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def _table_exists(conn, table):
+    return conn.execute(sa.text(
+        "SELECT COUNT(*) FROM INFORMATION_SCHEMA.TABLES "
+        "WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = :t"
+    ), {"t": table}).scalar() > 0
+
+
+def upgrade():
+    bind = op.get_bind()
+    if _table_exists(bind, 'support_knowledge'):
+        return
+    op.create_table(
+        'support_knowledge',
+        sa.Column('id', sa.Integer, primary_key=True),
+        sa.Column('title', sa.String(200), nullable=False),
+        sa.Column('content', sa.Text, nullable=False),
+        sa.Column('active', sa.Boolean, nullable=False, server_default='1'),
+        sa.Column('sort_order', sa.Integer, nullable=False, server_default='0'),
+        sa.Column('created_by', sa.Integer,
+                  sa.ForeignKey('users.id', ondelete='SET NULL'), nullable=True),
+        sa.Column('created_at', sa.DateTime, nullable=False),
+        sa.Column('updated_at', sa.DateTime, nullable=False),
+    )
+
+
+def downgrade():
+    bind = op.get_bind()
+    if _table_exists(bind, 'support_knowledge'):
+        op.drop_table('support_knowledge')