8aac24b566
Migration 0016: backend_servers (id, backend_id, name, address, port, weight, backup, active) + backends.lb_algorithm. Daten-Migration kopiert bestehende backends.address/port als ersten Server, dann DROP COLUMN. HAProxy-Renderer: rendert pro Backend einen Block mit `balance <algo>` + N `server`-Zeilen (weight, backup-Flag, optional check inter 5s). LB-Algorithmen: roundrobin / leastconn / source. REST: /backends/:id/servers (GET/POST), /backend-servers/:id (PUT/DELETE). Re-rendert HAProxy nach jeder Server-Mutation. UI: address/port aus Backend-Form raus, lb_algorithm-Select rein. Server verwaltet ein expandable Sub-Panel pro Backend-Row (Tabelle + Add/Edit/ Delete-Modal). Domain-Attachment-Multi-Select bleibt. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
82 lines
3.1 KiB
SQL
82 lines
3.1 KiB
SQL
-- +goose Up
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-- +goose StatementBegin
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-- v1.0.49: backends wird vom Single-Server-Endpoint zum Pool.
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-- Bisher: backends.address/port → genau ein Upstream.
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-- Jetzt: backends = Pool-Definition (LB-Algo, Healthcheck), die
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-- konkreten Upstreams leben in backend_servers (1:N).
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-- Damit kann eine Domain → ein Backend → N Server (HAProxy macht
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-- den Loadbalance laut backends.lb_algorithm).
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CREATE TABLE IF NOT EXISTS backend_servers (
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id BIGSERIAL PRIMARY KEY,
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backend_id BIGINT NOT NULL REFERENCES backends(id) ON DELETE CASCADE,
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name TEXT NOT NULL,
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address TEXT NOT NULL,
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port INTEGER NOT NULL,
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weight INTEGER NOT NULL DEFAULT 100,
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backup BOOLEAN NOT NULL DEFAULT FALSE,
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active BOOLEAN NOT NULL DEFAULT TRUE,
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created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
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updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
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CONSTRAINT backend_servers_name_unique UNIQUE (backend_id, name),
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CONSTRAINT backend_servers_port_check CHECK (port > 0 AND port < 65536),
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CONSTRAINT backend_servers_weight_check CHECK (weight >= 0 AND weight <= 256)
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);
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CREATE INDEX IF NOT EXISTS idx_backend_servers_backend
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ON backend_servers (backend_id);
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CREATE INDEX IF NOT EXISTS idx_backend_servers_active
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ON backend_servers (backend_id, active) WHERE active;
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-- LB-Algorithmus pro Backend. Default roundrobin entspricht haproxy-
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-- default; source = sticky-per-Source-IP (für stateful Apps ohne
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-- shared session store).
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ALTER TABLE backends
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ADD COLUMN IF NOT EXISTS lb_algorithm TEXT NOT NULL DEFAULT 'roundrobin';
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ALTER TABLE backends
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DROP CONSTRAINT IF EXISTS backends_lb_check;
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ALTER TABLE backends
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ADD CONSTRAINT backends_lb_check
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CHECK (lb_algorithm IN ('roundrobin', 'leastconn', 'source'));
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-- Daten-Migration: jede bisherige backends-Row produziert genau eine
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-- backend_servers-Row mit demselben address/port. name = backends.name
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-- damit der HAProxy-server-id stabil bleibt (haproxy stats / logs
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-- referenzieren ihn). Idempotent — bei Re-Apply gibt's einen Skip
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-- über das Unique-Constraint.
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INSERT INTO backend_servers (backend_id, name, address, port, active)
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SELECT id, name, address, port, active
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FROM backends
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WHERE address IS NOT NULL AND port IS NOT NULL
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ON CONFLICT (backend_id, name) DO NOTHING;
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-- Erst nach erfolgreichem Insert die alten Spalten droppen. Wenn die
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-- Migration mittendrin abbricht, sind die Daten in beiden Tabellen
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-- vorhanden — wir verlieren nichts.
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ALTER TABLE backends DROP COLUMN IF EXISTS address;
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ALTER TABLE backends DROP COLUMN IF EXISTS port;
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-- +goose StatementEnd
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-- +goose Down
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-- +goose StatementBegin
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ALTER TABLE backends ADD COLUMN IF NOT EXISTS address TEXT;
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ALTER TABLE backends ADD COLUMN IF NOT EXISTS port INTEGER;
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UPDATE backends b
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SET address = bs.address,
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port = bs.port
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FROM (
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SELECT DISTINCT ON (backend_id) backend_id, address, port
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FROM backend_servers
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ORDER BY backend_id, id ASC
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) bs
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WHERE b.id = bs.backend_id;
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ALTER TABLE backends DROP CONSTRAINT IF EXISTS backends_lb_check;
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ALTER TABLE backends DROP COLUMN IF EXISTS lb_algorithm;
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DROP TABLE IF EXISTS backend_servers;
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-- +goose StatementEnd
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