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Although SQLAlchemy supports database solutions in addition to the ones supported by Home Assistant, it will behave differently on different databases, and features relied on by the recorder may work differently, or not at all, in different databases.

Automatically purge the database every night at 04:12 local time. Purging keeps the database from growing indefinitely, which takes up disk space and can make Home Assistant slow. If you disable auto_purge it is recommended that you create an automation to call the recorder.purge periodically.

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Automatically repack the database every second sunday after the auto purge. Without a repack, the database may not decrease in size even after purging, which takes up disk space and can make Home Assistant slow. If you disable auto_repack it is recommended that you create an automation to call the recorder.purge periodically. This flag has no effect if auto_purge is disabled.

Call the service recorder.purge to start a purge task which deletes events and states older than x days, according to keep_days service data.Note that purging will not immediately decrease disk space usage but it will significantly slow down further growth.

Call the service recorder.purge_entities to start a task that purges events and states from the recorder database that match any of the specified entity_id, domains and entity_globs fields. Leaving all three parameters empty will result in all entities being selected for purging.

If you are running a database server instance on the same server as Home Assistant then you must ensure that this service starts before Home Assistant. For a Linux instance running Systemd (Raspberry Pi, Debian, Ubuntu and others) you should edit the service file.To help facilitate this, db_max_retry and db_retry_wait variables have been added to ensure the recorder retries the connection to your database enough times, for your database to start up.

The recorder is a family of woodwind musical instruments in the group known as internal duct flutes: flutes with a whistle mouthpiece, also known as fipple flutes. A recorder can be distinguished from other duct flutes by the presence of a thumb-hole for the upper hand and seven finger-holes: three for the upper hand and four for the lower. It is the most prominent duct flute in the western classical tradition.[1]

Recorders are made in various sizes with names and compasses roughly corresponding to various vocal ranges. The sizes most commonly in use today are the soprano (also known as descant, lowest note C5), alto (also known as treble, lowest note F4), tenor (lowest note C4), and bass (lowest note F3). Recorders were traditionally constructed from wood or ivory. Modern professional instruments are almost invariably of wood, often boxwood; student and scholastic recorders are commonly of moulded plastic. The recorders' internal and external proportions vary, but the bore is generally reverse conical (i.e. tapering towards the foot) to cylindrical, and all recorder fingering systems make extensive use of forked fingerings.

The recorder is first documented in Europe in the Middle Ages, and continued to enjoy wide popularity in the Renaissance and Baroque periods, but was little used in the Classical and Romantic periods. It was revived in the twentieth century as part of the historically informed performance movement, and became a popular amateur and educational instrument. Composers who have written for the recorder include Monteverdi, Lully, Purcell, Handel, Vivaldi, Telemann, Bach, Hindemith, and Berio.[2] There are many professional recorder players who demonstrate the full solo range of the instrument, and a large community of amateurs.[3]

The sound of the recorder is often described as clear and sweet,[2] and has historically been associated with birds and shepherds. It is notable for its quick response and its corresponding ability to produce a wide variety of articulations. This ability, coupled with its open finger holes, allow it to produce a wide variety of tone colours and special effects. Acoustically, its tone is relatively pure and, when the edge is positioned in the center of the airjet, odd harmonics predominate in its sound (when the edge is decidedly off-center, an even distribution of harmonics occurs).[4][2]

The instrument has been known by its modern English name at least since the fourteenth century. David Lasocki reports the earliest use of "recorder" in the household accounts of the Earl of Derby (later King Henry IV) in 1388, which register i. fistula nomine Recordour (one pipe called 'Recordour').[5]

The English verb record (from Middle French recorder, early thirteenth century) meant "to learn by heart, to commit to memory, to go over in one's mind, to recite", but it was not used in English to refer to playing music until the sixteenth century, when it gained the meaning "silently practicing a tune" or "sing or render in song" (both almost exclusively referring to songbirds), long after the recorder had been named.[9] The name of the instrument is also uniquely English: in Middle French there is no equivalent noun sense of recorder referring to a musical instrument.[13]

Partridge indicates that the use of the instrument by jongleurs led to its association with the verb: recorder the minstrel's action, a recorder the minstrel's tool.[5][14] The reason this instrument is known as the recorder, but not one of the other instruments played by the jongleurs, is uncertain.

The introduction of the Baroque recorder to England by a group of French professionals in 1673 popularised the French name for the instrument, flute douce, or simply flute, a name previously (and subsequently) reserved for the transverse instrument. Until about 1695, the names recorder and flute overlapped, but from 1673 to the late 1720s in England, the word flute always meant recorder.[5] In the 1720s, as the transverse flute overtook the recorder in popularity, English adopted the convention already present in other European languages of qualifying the word flute, calling the recorder variously the "common flute", "common English-flute", or simply "English flute" while the transverse instrument was distinguished as the "German flute" or simply "flute".[15] Until at least 1765, some writers still used flute to mean recorder.[5]

Until the mid-eighteenth century, musical scores written in Italian refer to the instrument as flauto, whereas the transverse instrument was called flauto traverso. This distinction, like the English switch from recorder to flute, has caused confusion among modern editors, writers and performers.

Indeed, in most European languages, the first term for the recorder was the word for flute alone. In the present day, cognates of the word flute, when used without qualifiers, remain ambiguous and may refer to either the recorder, the modern concert flute, or other non-western flutes. Starting in the 1530s, these languages began to add qualifiers to specify this particular flute.[5]

Today, recorder sizes are named after the different vocal ranges. This is not, however, a reflection of sounding pitch, and serves primarily to denote the pitch relationships between the different instruments. Groups of recorders played together are referred to as "consorts". Recorders are also often referred to by their lowest sounding note: "recorder in F" refers to a recorder with lowest note F, in any octave.

Modern variations include standard British terminology, due to Arnold Dolmetsch, which refers to the recorder in C5 (soprano) as the descant and the recorder in F4 (alto) as the treble. As conventions and instruments vary, especially for larger and more uncommon instruments, it is often practical to state the recorder's lowest note along with its name to avoid confusion.

Modern recorder parts are notated in the key they sound in. Parts for alto, tenor and contrabass recorders are notated at pitch, while parts for sopranino, soprano, bass, and great bass are typically notated an octave below their sounding pitch. As a result, soprano and tenor recorders are notated identically; alto and sopranino are notated identically; and bass and contrabass recorders are notated identically. Octave clefs may be used to indicate the sounding pitch, but usage is inconsistent.

The earliest known document mentioning "a pipe called Recordour" dates from 1388.[18]Historically, recorders were used to play vocal music and parts written for other instruments, or for a general instrument. As a result, it was frequently the performers' responsibility to read parts not specifically intended for the instrument and to choose appropriate instruments. When such consorts consisted only of recorders, the pitch relationships between the parts were typically preserved, but when recorders were combined with other instruments, octave discrepancies were often ignored.[19]

In modern usage, recorders not in C or F are alternatively referred to using the name of the closest instrument in C or F, followed by the lowest note. For example, a recorder with lowest note G4 may be known as a G-alto or alto in G, a recorder with lowest note D5 (also "sixth flute") as a D-soprano or soprano in D, and a recorder in G3 as a G-bass or G-basset. This usage is not totally consistent. Notably, the baroque recorder in D4 is not commonly referred to as a D-tenor nor a D-alto; it is most commonly referred to using the historical name "voice flute".

Recorders have historically been constructed from hardwoods and ivory, sometimes with metal keys. Since the modern revival of the recorder, plastics have been used in the mass manufacture of recorders, as well as by a few individual makers.[26]

Today, a wide variety of hardwoods are used to make recorder bodies.[27][28][29][30][31][32] Relatively fewer varieties of wood are used to make recorder blocks, which are often made of red cedar, chosen because of its rot resistance, ability to absorb water, and low expansion when wet. A recent innovation is the use of synthetic ceramics in the manufacture of recorder blocks.[33] 006ab0faaa