Add printer lifecycle fields and printer log

- Printer: bought_at, last_maintenance_at, decommissioned_at (all Date, nullable)
- PrinterLog: per-printer timestamped text entries (CASCADE delete)
- Migration 0003: adds columns + printer_logs table
- /printers/{id}: detail page showing lifecycle info + scrollable log
- POST /printers/{id}/log: add a log entry via modal form
- Printer names in list are now links to the detail page
- Add Printer modal includes optional purchase date

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

alembic/versions/0003_printer_lifecycle_and_logs.py

@@ -0,0 +1,39 @@
+"""printer lifecycle fields and printer_logs table
+
+Revision ID: 0003
+Revises: 0002
+Create Date: 2026-06-18
+
+"""
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+
+revision: str = "0003"
+down_revision: Union[str, None] = "0002"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.add_column("printers", sa.Column("bought_at", sa.Date(), nullable=True))
+    op.add_column("printers", sa.Column("last_maintenance_at", sa.Date(), nullable=True))
+    op.add_column("printers", sa.Column("decommissioned_at", sa.Date(), nullable=True))
+
+    op.create_table(
+        "printer_logs",
+        sa.Column("id", sa.Integer(), autoincrement=True, nullable=False),
+        sa.Column("printer_id", sa.Integer(), nullable=False),
+        sa.Column("message", sa.Text(), nullable=False),
+        sa.Column("created_at", sa.DateTime(), nullable=False, server_default=sa.text("CURRENT_TIMESTAMP")),
+        sa.ForeignKeyConstraint(["printer_id"], ["printers.id"], name="fk_log_printer", ondelete="CASCADE"),
+        sa.PrimaryKeyConstraint("id"),
+    )
+
+
+def downgrade() -> None:
+    op.drop_table("printer_logs")
+    op.drop_column("printers", "decommissioned_at")
+    op.drop_column("printers", "last_maintenance_at")
+    op.drop_column("printers", "bought_at")

app/models/__init__.py

@@ -3,7 +3,8 @@ from app.models.filament import Filament
 from app.models.pricing import PricingConfig
 from app.models.print_job import PrintJob
 from app.models.printer import Printer
+from app.models.printer_log import PrinterLog
 from app.models.printer_type import PrinterType
 from app.models.todo import Todo
 
-__all__ = ["Base", "Printer", "PrinterType", "Filament", "PrintJob", "Todo", "PricingConfig"]
+__all__ = ["Base", "Printer", "PrinterLog", "PrinterType", "Filament", "PrintJob", "Todo", "PricingConfig"]

app/models/printer.py

@@ -1,7 +1,7 @@
 import enum
-from datetime import datetime
+from datetime import date, datetime
 
-from sqlalchemy import DateTime, Enum, ForeignKey, String, func
+from sqlalchemy import Date, DateTime, Enum, ForeignKey, String, func
 from sqlalchemy.orm import Mapped, mapped_column, relationship
 
 from app.models.base import Base
@@ -24,6 +24,9 @@ class Printer(Base):
     status: Mapped[PrinterStatus] = mapped_column(
         Enum(PrinterStatus), default=PrinterStatus.offline
     )
+    bought_at: Mapped[date | None] = mapped_column(Date)
+    last_maintenance_at: Mapped[date | None] = mapped_column(Date)
+    decommissioned_at: Mapped[date | None] = mapped_column(Date)
     created_at: Mapped[datetime] = mapped_column(DateTime, server_default=func.now())
     updated_at: Mapped[datetime] = mapped_column(
         DateTime, server_default=func.now(), onupdate=func.now()
@@ -32,3 +35,6 @@ class Printer(Base):
     printer_type: Mapped["PrinterType | None"] = relationship(back_populates="printers")
     jobs: Mapped[list["PrintJob"]] = relationship(back_populates="printer")
     todos: Mapped[list["Todo"]] = relationship(back_populates="printer")
+    logs: Mapped[list["PrinterLog"]] = relationship(
+        back_populates="printer", order_by="PrinterLog.created_at.desc()"
+    )

app/models/printer_log.py

@@ -0,0 +1,17 @@
+from datetime import datetime
+
+from sqlalchemy import DateTime, ForeignKey, Text, func
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.models.base import Base
+
+
+class PrinterLog(Base):
+    __tablename__ = "printer_logs"
+
+    id: Mapped[int] = mapped_column(primary_key=True)
+    printer_id: Mapped[int] = mapped_column(ForeignKey("printers.id"))
+    message: Mapped[str] = mapped_column(Text)
+    created_at: Mapped[datetime] = mapped_column(DateTime, server_default=func.now())
+
+    printer: Mapped["Printer"] = relationship(back_populates="logs")

app/routers/ui.py

@@ -8,6 +8,7 @@ from app.db import get_db
 from app.models.filament import Filament
 from app.models.print_job import JobStatus, PrintJob
 from app.models.printer import Printer, PrinterStatus
+from app.models.printer_log import PrinterLog
 from app.models.printer_type import PrinterType
 from app.models.pricing import PricingConfig
 from app.models.todo import Todo
@@ -48,18 +49,42 @@ def create_printer(
     name: str = Form(...),
     location: str = Form(""),
     type_id: str = Form(""),
+    bought_at: str = Form(""),
     db: Session = Depends(get_db),
 ):
+    from datetime import date
     printer = Printer(
         name=name.strip(),
         location=location.strip() or None,
         type_id=int(type_id) if type_id else None,
+        bought_at=date.fromisoformat(bought_at) if bought_at else None,
     )
     db.add(printer)
     db.commit()
     return RedirectResponse(url="/printers", status_code=HTTP_303_SEE_OTHER)
 
 
+@router.get("/printers/{printer_id}", response_class=HTMLResponse)
+def printer_detail(printer_id: int, request: Request, db: Session = Depends(get_db)):
+    printer = db.query(Printer).filter(Printer.id == printer_id).first()
+    if not printer:
+        from fastapi import HTTPException
+        raise HTTPException(status_code=404, detail="Printer not found")
+    return templates.TemplateResponse("printer_detail.html", {
+        "request": request,
+        "active": "printers",
+        "printer": printer,
+    })
+
+
+@router.post("/printers/{printer_id}/log")
+def add_printer_log(printer_id: int, message: str = Form(...), db: Session = Depends(get_db)):
+    entry = PrinterLog(printer_id=printer_id, message=message.strip())
+    db.add(entry)
+    db.commit()
+    return RedirectResponse(url=f"/printers/{printer_id}", status_code=HTTP_303_SEE_OTHER)
+
+
 @router.get("/printer-types", response_class=HTMLResponse)
 def printer_types_page(request: Request, db: Session = Depends(get_db)):
     return templates.TemplateResponse("printer_types.html", {

app/templates/printer_detail.html

@@ -0,0 +1,109 @@
+{% extends "base.html" %}
+{% block title %}{{ printer.name }} — POPS{% endblock %}
+
+{% block content %}
+<div class="d-flex align-items-center gap-3 mb-4">
+  <a href="/printers" class="text-secondary text-decoration-none"><i class="bi bi-arrow-left"></i></a>
+  <h5 class="text-white mb-0">{{ printer.name }}</h5>
+  {% set s = printer.status.value %}
+  {% if   s == 'printing' %}<span class="badge bg-primary">printing</span>
+  {% elif s == 'idle'     %}<span class="badge bg-success">idle</span>
+  {% elif s == 'error'    %}<span class="badge bg-danger">error</span>
+  {% else                 %}<span class="badge bg-secondary">offline</span>
+  {% endif %}
+  {% if printer.decommissioned_at %}
+  <span class="badge bg-warning text-dark">decommissioned</span>
+  {% endif %}
+</div>
+
+<div class="row g-3 mb-4">
+
+  {# ── Info card ── #}
+  <div class="col-md-6">
+    <div class="card h-100">
+      <div class="card-header text-secondary small text-uppercase fw-normal" style="border-color:#21262d">Details</div>
+      <div class="card-body">
+        <table class="table table-dark table-sm mb-0" style="font-size:.875rem">
+          <tbody>
+            <tr><td class="text-secondary border-0" style="width:40%">Type</td>
+                <td class="border-0">{{ printer.printer_type.name if printer.printer_type else '—' }}</td></tr>
+            <tr><td class="text-secondary">Bed volume</td>
+                <td>{% if printer.printer_type %}{{ printer.printer_type.bed_x_mm }}×{{ printer.printer_type.bed_y_mm }}×{{ printer.printer_type.bed_z_mm }} mm{% else %}—{% endif %}</td></tr>
+            <tr><td class="text-secondary">Location</td>
+                <td>{{ printer.location or '—' }}</td></tr>
+          </tbody>
+        </table>
+      </div>
+    </div>
+  </div>
+
+  {# ── Lifecycle card ── #}
+  <div class="col-md-6">
+    <div class="card h-100">
+      <div class="card-header text-secondary small text-uppercase fw-normal" style="border-color:#21262d">Lifecycle</div>
+      <div class="card-body">
+        <table class="table table-dark table-sm mb-0" style="font-size:.875rem">
+          <tbody>
+            <tr><td class="text-secondary border-0" style="width:50%">Purchased</td>
+                <td class="border-0">{{ printer.bought_at.strftime('%d.%m.%Y') if printer.bought_at else '—' }}</td></tr>
+            <tr><td class="text-secondary">Last maintenance</td>
+                <td>{{ printer.last_maintenance_at.strftime('%d.%m.%Y') if printer.last_maintenance_at else '—' }}</td></tr>
+            <tr><td class="text-secondary">Decommissioned</td>
+                <td>{{ printer.decommissioned_at.strftime('%d.%m.%Y') if printer.decommissioned_at else '—' }}</td></tr>
+          </tbody>
+        </table>
+      </div>
+    </div>
+  </div>
+
+</div>
+
+{# ── Log ── #}
+<div class="d-flex align-items-center justify-content-between mb-3">
+  <h6 class="text-white mb-0">Log</h6>
+  <button class="btn btn-sm btn-outline-primary" data-bs-toggle="modal" data-bs-target="#addLogModal">
+    <i class="bi bi-plus-lg me-1"></i>Add entry
+  </button>
+</div>
+
+<div class="card">
+  {% if printer.logs %}
+  <table class="table table-dark table-hover mb-0 align-middle">
+    <tbody>
+    {% for entry in printer.logs %}
+    <tr>
+      <td class="text-secondary small" style="width:140px;white-space:nowrap">
+        {{ entry.created_at.strftime('%d.%m.%Y %H:%M') }}
+      </td>
+      <td>{{ entry.message }}</td>
+    </tr>
+    {% endfor %}
+    </tbody>
+  </table>
+  {% else %}
+  <div class="card-body text-secondary">No log entries yet.</div>
+  {% endif %}
+</div>
+
+{# ── Add log entry modal ── #}
+<div class="modal fade" id="addLogModal" tabindex="-1">
+  <div class="modal-dialog">
+    <div class="modal-content bg-dark border-secondary">
+      <form method="POST" action="/printers/{{ printer.id }}/log">
+        <div class="modal-header border-secondary">
+          <h6 class="modal-title text-white">Add Log Entry</h6>
+          <button type="button" class="btn-close btn-close-white" data-bs-dismiss="modal"></button>
+        </div>
+        <div class="modal-body">
+          <textarea name="message" class="form-control bg-dark border-secondary text-white"
+                    rows="3" placeholder="What happened?" required autofocus></textarea>
+        </div>
+        <div class="modal-footer border-secondary">
+          <button type="button" class="btn btn-secondary btn-sm" data-bs-dismiss="modal">Cancel</button>
+          <button type="submit" class="btn btn-primary btn-sm">Add</button>
+        </div>
+      </form>
+    </div>
+  </div>
+</div>
+{% endblock %}

app/templates/printers.html

@@ -38,7 +38,7 @@
     <tbody>
     {% for p in printers %}
     <tr>
-      <td class="fw-medium text-white">{{ p.name }}</td>
+      <td><a href="/printers/{{ p.id }}" class="text-white text-decoration-none fw-medium">{{ p.name }}</a></td>
       <td class="text-secondary">{{ p.printer_type.name if p.printer_type else '—' }}</td>
       <td class="text-secondary small">
         {% if p.printer_type %}
@@ -96,6 +96,11 @@
                    placeholder="e.g. Workshop, Shelf 2">
           </div>
 
+          <div>
+            <label class="form-label text-secondary small">Purchase date</label>
+            <input type="date" name="bought_at" class="form-control bg-dark border-secondary text-white">
+          </div>
+
         </div>
         <div class="modal-footer border-secondary">
           <button type="button" class="btn btn-secondary btn-sm" data-bs-dismiss="modal">Cancel</button>